DOCSLIB.ORG

Watches Wanted All Types Ofrepairs and Restorations

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text

Load more

Your Customers Can Take PRICE REDUCTION! Home an Instant Photo of Test Gold What They Want in Two Seconds with RS MIZAR! You Won't Doubt the Value of Your Go1d Purchases Again! M-18A $159.95 For the first time ever, you can afford to protect yourself against underkarating by using the latest Jewelry PhotoMaster IV patented technology developed by RS Mizar. Includes: These testers are: • Polaroid's top of the line, fully • Fast, safe, reliable, and portable automatic Spectra Camera, with • Incredibly simple to use, non-destructive timer and control panel for • Accurately determine gold karat values of increased flexibility Jewe1ry PhotoMaster Basic yellow, white green, and red gold • Close-up Lens and Multiple Includes: • Identifies platinum and can distinguish Exposure attachments • Polaroids' top of the line, fully non-gold or gold plate from true karat gold • Custom Jewelry Photo Stand automatic Spectra Camera, with multi-color ring trays and with timer and control panel Don't be unsure! Safeguard your investments and jewelry pads for increased flexibility reputation with confidence. The tester is mainte­ • Rub-on Diamond Transfers for • Close-up Lens and Multiple nance free, portable (battery operated), and has a jewelry design and special Exposure attachments full 2-Year Factory Warranty. *Made in Polaroid Photo Writer Pen • Custom Jewelry Photo Stand U.S.A.* • Polaroid Photo Display Mounts with multi-color ring trays and • Oversized "full system" carrying jewelry pads ET-18 Precisely case ($65 Value) • Rub-on Diamond Transfers $99.00 - determines gold • Jewelry Inventory Control Cards for jewelry design and special with Multiple Price Tags Polaroid Photo Writer Pen karat value of • Newspaper Ad Slicks promoting yellow, white, • Polaroid Photo Display ·' jewelry photo services Mounts green and red " Bonus Mail-in Coupon good for "" Jewelry Inventory Control gold in the lOK, a FREE twin pack of Spectra Cards with Multiple Price 14K and 18K, High Definition Film ($25 Tags instantly. It Value) • Newspaper Ad Slicks promot­ operates in a • Instructional Video and Manuals ing jewelry photo services very similar way ($19.95 Value) • Instructional Manuals totheM18A, but easily fits List Price $349 List Price $249 into your NOW ONLY NOW ONLY pocket! $299 $199 VOLUME 17, NUMBER 5 MAY 1993 HOROLOGICAL Clock Bushing Tool Official Publication of the American Watchmakers-Clockmakers Institute 6 Wes Door 2 PRESIDENT'S MESSAGE Henry B. Fried 4 QUESTIONS & ANSWERS Bennett's Watch Synchronizer The Agassiz Watch Robert D. Porter 6 AN ECONOMICAL CLOCK BUSHING TOOL Tools Necessary Fred S. Burckhardt 13 ROCK QUARRY My Old School Pals Arty & Jim .. in Jewelry Repair Archie B. Perkins 14 TECHNICALLY WATCHES 32 Antique Watch Restoration Partl..XXXIX Dewey Clark 20 CLOCKS INSIDE & OUT Balance Assemblies: Principles of Operation and a Little History, Part JI/ John P. Kenyon 28 THE APPRENTICE CLOCKMAKER Clock Movement Maintenance, Part JI/ Releasing the Power from the Mainspring Waltham Military Marshall F. Richmond 32 PICKLE BARREL Wristwatches Jewelry Crafting and Repair Necessary Tools: Their Uses and Care 36 Wes Door 35 SHOP TALK Module Retrofitting Marvin E. Whitney 36 MILITARY TIME Waltham Wristwatch DEPARTMENTS James Williams 40 CLEANING AND REPAIRING Bulletln Board/12 THE QUAIL CUCKOO CLOCK Association News/19 Part II New Membera/25 Ask Huck/26 HOROLOGICAL TIMES (ISSN0145-9546) is published monthly and copyrighted by the American Material Search Network/30 Watchmakers lnstiMe, 3700 Harrison Avenue, Cincinnati, Ohio 45211, for$45.00 per year ($4.50 per copy New Products/News In the Trade/43 in the United States and $50.00 per year, $5.50 per copy outside the U.S.) Second class postage paid at Cincinnati, Ohio. POSTMASTER: Send address changes to HOROLOGICAL TIMES, P.O. Box 11011, Classlfled Ads/44 Cincinnati, Ohio 45211. Dates to Remember/48 OFFICE HOURS: Monday through Friday 8:00 AM to 4:00 PM (Eastern Standard Time). Closed on Advertisers' lndex/48 all national holidays. PHONE (513) 661-3838, AWi HOTLINE: (513) 661-4636 (24-hour recording), FAX (513) 661-3131. 1 HOROLOGICAL~ M * FELLOWS * OF THE AMERICAN WATCHMAKERS INSTITUTE IYl n .~«·ri-, LuJ L_j . ,~ I James H. Broughton Harold J. Herman UD George Daniels Gerald G. Jaeger EXECUTIVE AND EDITORIAL OFFICES Henry B. Fried Robert A. Nelson Josephine F. Hagans •Hamilton E. Pease AWi Central • Orville R. Hagans Milton C. Stevens P.O. Box 11011 Ewell D. Hartman Marvin E. Whitney 3700 Harrison Avenue *Deceased Cincinnati, OH 45211 Telephone: (513) 661-3838 Fax: (513) 661-3131 Milton C. Stevens: Editor Regina Stenger: Associate Editor President's Message Donna Baas: Production Director Harold J. Herman: Senior Technical Editor It has been brought to my attention that there is a need to remind members that we have an A WI Margie M. Brater: Circulation Manager Referral Service. Certainly there are many who Nancy Wellmann: Business Manager have participated in this service, and also many Mary Sansalone: Seminar Coordinator others who may not know about it. Robert Macomber, CMC wrote about this program in TECHNICAL EDITORS Robert F. Bishop J.M. Huckabee the January 1989 Horological Times, shortly James H. Broughton John P. Kenyon after this program was approved by the A WI Fred S. Burckhardt John A. Nagle Board ofDirectors. Although we encourage mem­ David A. Christianson Archie B. Perkins bers to join this program, it is not mandatory. Charles aeves Robert D. Porter What is the AW! Referral Service? It is Joe Crooks Marshall F. Richmond a method to allow our name to be used for Wes Door Marvin E. Whitney newcomers moving into our area. We list our Henry B. Fried services and we are on a list which our fellow A WI members may use to refer AWi OFFICERS business to us. Wes Door, CMW: President Why this service? We are a mobile nation. Some of our customers move Joseph L. Cerullo, CMW, CMC: First Vice President away and some move from faraway places to relocate in our area. It is nice to Henry Frystak, CMW: Second Vice President have a method to recommend someone who can continue to give good profes­ Fred S. Burckhardt: Secretary sional service. In the case of those moving into our area, it is nice to acquire these Gerald G. Jaeger, CMW, CMEW, FAWI: Treasurer new customers via this referral system. How do you join this service? Ifyou wish to be included in this service, AWi DIRECTORS just fill out the form found on this month's mailing envelope and send it to A WI William Biederman, CMW Central. This form asks for your name, address, phone number, specialty, and Robert F. Bishop, CMEW certificate (if appropriate). A WI has established a file by zip codes. Your name Buddy Carpenter, CMC, CMEW Charles Cleves will be added to the list; you will receive confirmation of your participation. Ewell D. Hartman, CMW, FAWI If a customer asks us for the name of a reliable clockmaker or Gerhard Hutter, CMW watchmaker in their future home area, we simply ask them for their new zip Benjamin Matz, CMW code. Then we contact A WI Central for a listing of A WI members in our John A. Nagle customer's new zip code area and adjacent areas. This list is given to our Robert A. Nelson, CMW, CMEW, FAWI customer. Of course we must explain that this listing does not carry a Marshall F. Richmond, CMW recommendation, but does signify the name is that of an A WI member who has James E. Williams, CC access to the latest technical information necessary to perform reliable service work. Joseph L. Cerullo, CMW, CMC: Affiliate Chapter Director Some of us sell watches, diamonds, and other jewelry as well as doing Tony Knorr: Research & Education Council Director repair work. These new customers can be a real plus for our business. Alice B. Carpenter, CMW, CMEW: Immediate Past Sometimes it's impossible to "get rid" of a customer because they have President moved away. Case in point ... I sold a watch that I keep getting back each time it needs a cell. They feel more secure sending it back to me to change the cell, Milton C. Stevens, FAWI: Executive Secretary even though the postage makes it more expensive for my customer than would David LaFleche: General Manager be necessary if we could refer them to someone in their new area. James Lubic: Technical & Educational Services Manager Please consider this service. Remember, we have nothing to lose and Henry B. Fried, CMW, CMC, FAWI: Technical a good possibility of new customers to gain. Director Reprinting and reproduction la prohibited with­ out written permission from the American Watch­ makers-Clockmaker• Institute. Copyrlght©1993 by the American Watchmakers-Clockmakers In­ ON THE FRONT: These yellow lilies were stitute. photographed by Mr. Harold Bertha of Pearl River, New York. 2 Horological Times/May 1993 RARE OPPORTUNITY by J.D. Olson A.W.I. #22128 He walked into the room and it was a clock collectors dream. Everywhere he looked, there were clocks. Old clocks, old-old clocks, some not so old, but rare, some old and rare. Some large, some small. But all of them were clocks, and wonderful. And there it was. Sitting on a special stand, right in the middle of all those other beautiful clocks. "That's it, That's the one I want!" he exclaimed. "Oh Yes" was the reply. "That one is not for sale. That's a limited edition Atmos," he continued, "I purchased it back in 1984 for only $2,950.00, but I understand it is worth about $6,000.00 today." This proud owner seemed to glow as he continued to explain about his prize. "You see, only 750 were set aside for North America.
Recommended publications
  • Invar, Established a New Standard in the Way Precise Surveying Measurements Were Made, Both in Reliability and Accuracy

    Invar, Established a New Standard in the Way Precise Surveying Measurements Were Made, Both in Reliability and Accuracy

    I N VA R The Breakthrough for a Low Expansion Alloy he discovery of the low expansion alloy, Invar, established a new standard in the way precise surveying measurements were made, both in reliability and accuracy. It became the first successful attempt to produce a metal alloy exhibiting a nearly zero coefficient of thermal expansion. In 1889, James Riley of Glasgow, Scotland, brought before the Iron and Steel Institute his investigations into the making of an alloy through a series of tests which combined up to 49 percent nickel with iron. Seven years later, in 1896, Charles Edouard Guillaume, a Swiss-born metallurgist and employee with the International Bureau of Weights and Measures near Paris, began looking specifically for an alloy to be used for surveyors’ wires that would not noticeably change when exposed to temperature variations. While experimenting with nickel contents between 30 and 60 percent, Guillaume discovered the coefficient of expansion at room temperature was lowest when mixing a nickel content of 36 percent with 64 percent iron. Since his new alloy exhibited the least amount of thermal expansion, and because Guillaume considered it invariable, it quickly became known as “Invar”. In 1920, Guillaume was awarded the Nobel Prize in Physics for his discovery of Invar >> By Jerry Penry, PS Displayed with permission • The American Surveyor • Vol. 9 No. 10 • Copyright 2012 Cheves Media • www.Amerisurv.com The Sokkia BIS30 3-meter Invar bar code leveling staff in use during a high precision survey. Image courtesy of Sokkia Corporation. Displayed with permission • The American Surveyor • Vol. 9 No.
  • Watch and Clock Makers

    Watch and Clock Makers

    Records Service Records Indexes Watch and Clock Makers This index contains the names; locations and type of watch and clock makers. www.worcestershire.gov.uk/records Complied by Francis Buckley, F.S.A. and George B. Buckley, M.C. from old newspapers and directories. Supplied by Worcester City Museum. January 1984 Surname First Name Established Place Watch/Clockmaker Newspaper Date Reason Other Information Bagnell Before 1770 Dudley Watchmaker Birmingham Gazette 26.02.70 Lost Watch Beavington William 1795 Stourbridge Watchmaker Universal British Directory 1795 Not mentioned Bowler James 1772 Stourbridge Clockmaker Birmingham Gazette 5.10.72 Advertised for John Chance his runaway apprentice Bradley Worcester Not mentioned A well known family of goldsmiths and horologists. An early 18th century watch marked "Bradley, Worcester" is in a Manchester collection. Bradley Samuel 1749-1761 Worcester Watchmaker & Goldsmith Weekly Worcester Journal 27.7.49 - 13.9.50 Bankrupt Berrows Worcester Journal 31.12.61 & 21.2.60 Not mentioned Birmingham Gazette London 6.4.55 Lost watches Evening Post 4.9.53 Not mentioned Birmingham Gazette 18.12.49, 21.1.51 & Not mentioned Bradley Mrs. 1774-1783 Worcester Goldsmith Birmingham Gazette 15.08.74 & 1.9.83 Died 23rd August 1783 High Street Possibly identical with (or related to) Samuel Bradley Bradley Joseph 1749 Worcester Watchmaker Weekly Worcester Journal 2.2.49 Not mentioned Brown Joseph 1767-1796 Worcester Clockmaker & Watchmaker & Berrows Worcester Journal 18.6.67 Mentioned at St. John's end of Severn Bridge Goldsmith Directories 1790 Not mentioned . 1792-96 Newport street Berrows Worcester Journal 27.5.71 St.
  • Magazine PATEK PHILIPPE

    Magazine PATEK PHILIPPE

    A TUFTS COMMUNICATIONS FINE JEWELRY PUBLICATION C.D.PEACOCK MAGAZINE • OVER 180 YEARS IN CHICAGO AUTUMN/HOLIDAY 2018 ISSUE 3 C.D.Peacockmagazine ROLEX Philanthropy CARTIER Classic Style MIKIMOTO A Lustrous Milestone World Timer by PATEK PHILIPPE HEARTS ON FIRE Put a ring on it FALL 2018 • ISSUE 3 Since 1837, C.D.Peacock has been the Chicago area’s premier source of fine diamonds. At C.D.Peacock we believe that a Scustomer, like a fine diamond, should be forever. Our position as a prominent International jeweler enables our access to the finest diamonds the world has to offer at the best value. We’ve based our reputation on it for over a century. Warmest greetings from all of us at C.D.Peacock. Each year we look forward to the opportunity to share with you our vision and passion that is translated into our exquisite jewelry. In this issue, you will find 2019 trends, profiles on a few of our favorite designers and Swiss watch brands, exotic travel destinations, and much more. While we strive to always stay ahead of the curve to bring you the latest jewelry designs and Wwatch innovations from around the world, at the heart of it all, we are still a family-owned business. At C.D.Peacock we believe in the traditional values of honesty, integrity, customer service, and philanthropy. We still hand-select each item we offer in our stores and have earned a reputation of tremendous international respect within the industry. This holiday season and beyond, we welcome the opportunity to help you select the perfect gift to honor those who give special meaning to your life.
  • Fine Watches & Wristwatches

    Fine Watches & Wristwatches

    Fine Watches & Wristwatches Including a Private English Collection Tuesday 11 June 2013 at 1pm New Bond Street, London Fine Watches & Wristwatches including a Private English Collection Tuesday 11 June 2013 at 1pm New Bond Street, London Bonhams Enquiries Illustrations Important Notice 101 New Bond Street Paul Maudsley Front cover: Lot 356 A surcharge of 2% is applicable London W1S 1SR +44 (0) 20 7447 7412 Back cover: Lot 36 (detail) when using Mastercard, Visa and bonhams.com Inside front cover: Lot 308 overseas debit cards. Kate Lacey Inside back cover: Lot 318 Viewing +44 (0) 20 7468 8301 The following symbol is used to denote that VAT is due on Sunday 9 June 11am to 3pm Sophia Guy-White Sale Number: 20747 the hammer price and buyer’s Monday 10 June 9am to 4.30pm +44 (0) 20 7447 7413 premium Tuesday 11 June 9am to 11am +44 (0) 20 7468 8370 fax Catalogue: £15 † VAT 20% on hammer price Highlight Viewing [email protected] and buyer’s premium Catalogue Subscriptions: 22 - 25 May +44 (0) 1666 502 200 Island Shangri-La Hotel Shipping * VAT on imported items at a preferential rate of 5% on Hong Kong For information and estimates hammer price and the prevailing on domestic and international rate on buyer’s premium Bids shipping please contact the Important notice +44 (0) 20 7447 7448 Department on: regarding importation Ω VAT on imported items at +44 (0) 20 7447 7401 fax +44 (0) 20 7 447 7413 into the United States 20% on hammer price and the To bid via the internet please visit [email protected] of Corum, Franck prevailing rate on buyer’s premium bonhams.com Muller, Piaget and Customer Services Rolex Watches.
  • Special-Purpose Nickel Alloys

    Special-Purpose Nickel Alloys

    © 2000 ASM International. All Rights Reserved. www.asminternational.org ASM Specialty Handbook: Nickel, Cobalt, and Their Alloys (#06178G) Special-Purpose Nickel Alloys NICKEL-BASE ALLOYS have a number of meet special needs. The grades considered in ganese, and copper, a 0.005% limit on iron, and unique properties, or combinations of proper- this section include the following: a 0.02% limit on carbon. This high purity re- ties, that allow them to be used in a variety of sults in lower coefficient of expansion, electri- specialized applications. For example, the high • Nickel 200 (99.6% Ni, 0.04% C) cal resistivity, Curie temperature, and greater resistivity (resistance to flow of electricity) and • Nickel 201 (99.6% Ni, 0.02% C maximum) ductility than those of other grades of nickel heat resistance of nickel-chromium alloys lead • Nickel 205 (99.6% Ni, 0.04% C, 0.04% Mg) and makes Nickel 270 especially useful for to their use as electric resistance heating ele- • Nickel 233 (see composition in table that fol- some electronics applications such as compo- ments. The soft magnetic properties of lows) nents of hydrogen thyratrons and as a substrate nickel-iron alloys are employed in electronic • Nickel 270 (99.97% Ni) for precious metal cladding. devices and for electromagnetic shielding of computers and communication equipment. Iron- Composition limits and property data on sev- eral of these grades can be found in the article nickel alloys have low expansion characteris- Resistance Heating Alloys tics as a result of a balance between thermal ex- “Wrought Corrosion-Resistant Nickels and pansion and magnetostrictive changes with Nickel Alloys” in this Handbook.
  • BSTJ 27: 3. July 1948: the Evolution of the Quartz Crystal Clock

    BSTJ 27: 3. July 1948: the Evolution of the Quartz Crystal Clock

    The Evolution of the Quartz Crystal Clock* By WARREN A. MARRISON SOME of the earliest documents in human history relate to man's interest in timekeeping. This interest arose partly because of his curiosity about the visible world around him, and partly because the art of time measure- ment became an increasingly important part of living as the need for cooper- ation between the members of expanding groups increased. There are still in existence devices believed to have been made by the Egyptians six thousand years ago for the purpose of telling time from the stars, and there is good reason to believe that they were in quite general use by the better educated people of that period. 1 Since that period there has been a continuous use and improvement of timekeeping methods and devices, following sometimes quite independent lines, but developing through a long series of new ideas and refinements into the very precise means at our disposal today. The art of timekeeping and time measurement is of very great value, both from its direct social use in permitting time tables and schedules to be made, and in its relation to other arts and the sciences in which the measurement of rate and duration assume ever increasing importance. The early history of timekeeping was concerned almost entirely with the first of these and for many centuries the chief purpose of timekeeping devices was to provide means for the approximate subdivision of the day, particularly of the day- light hours. The most obvious events marking the passage of time were the rising and setting of the sun and its continuous apparent motion from east to west through the sky.
  • Making Gravers by William R

    Making Gravers by William R

    WEAR YOUR SAFETY GLASSES FORESIGHT IS BETTER THAN NO SIGHT READ INSTRUCTIONS BEFORE OPERATING Making Gravers By William R. Smith William R. Smith is well known in the field of clock making. He has recently designed a T-rest for the Sherline lathe that makes it possible to hand turn parts using a tool called a “Graver”, which is a common technique in watch- and clock making. This technique is also used in instrument making and modelmaking for turning special shapes like ball ends without having to grind a specially shaped cutter for the job. Mr. Smith’s credentials include a degree in mechanical engineering as well as FBHI (Fellow, British Horological Institute), FNAWCC (Fellow, National Association of Watch and Clock Collectors), CMC (Certified Master Clockmaker), CMW (Certified Master Watchmaker) and CMEW (Certified Master Electronic Watchmaker.). He has published several books and videos on clock making which will be of interest to anyone wishing to learn more about hand turning techniques or about making clocks. CAUTION: Use gravers carefully. Hold work materials with a and ruin them, all sharpening must be done by hand on a collet. Do not use gravers with a 3-jaw or 4-jaw chuck. A graver bench stone or a special wet grinder. which is inadvertently pushed into a spinning chuck jaw can be The gravers to be described here do not suffer this problem. flung from your hands. See T-rest instructions for further cautions Though harder than high carbon steel gravers and slightly and turning techniques. more prone to chip, they can be reshaped at the bench grinder Carbide Gravers quickly and without harm provided one does not let them I have often been asked to explain why I seem so unimpressed go red or cool them in water during the shaping process.
  • Abbott's American Watchmaker and Jeweler

    Abbott's American Watchmaker and Jeweler

    Jlbbotf$ Jimericaii (Uatcbtnaker m(i lewder. ;vi> ^'o ^ ^^i#SK- '{»?B/^^ CM^ a/;: ABBOTT'S AMERICAN WATCHMAKER AND JEWELER AN ENCYCLOPEDIA FOR THE HOROLOGIST, JEWELER, GOLD AND SILVERSMITH CONTAINING HUNDREDS OF PRIVATE RECEIPTS AND FORMULAS COMPILED FROM THE BEST AND MOST RELIABLE SOURCES. COMPLETE DIRECTIONS FOR USING ALL THE LATEST TOOLS, ATTACHMENTS AND DEVICES FOR WATCHMAKERS AND JEWELERS BY HENRY G. ABBOTT ILLUSTRATED WITH 288 ENGRAVINGS C HidAGO: Ge&. K. Hazlitt & Co., PUPUSHBIIS, Copyrighted 1898, by Geo. K. Hazlitt & Co. PREFACE. THE first edition of this work was published in 1893 and met with an unexpected and unprecedented sale, and a second edition was placed upon the market in less than ten months. So much new matter was added that it was found necessary to reset the entire work in smaller type in order to keep the volume within the price at which it was originally placed on the market. It is the first and only book, of which the author has any knowledge, which illustrates and describes modern American tools for the watchmaker and jeweler. The ambitious workman is always in search of knowl- edge, in search of new ideas, new tools and new methods. Patient study, constant practice and ambition are requisite to become pro- ficient in any art. The demand for skilled workmen is constantly increasing, and a person wishing to thoroughly master any art, must be to a certain extent capable of self instruction. To be proficient in any art a man must not be deft of touch alone, but the head must also play its part.
  • Tiara Pair of Earrings in Chinoiserie Style

    Tiara Pair of Earrings in Chinoiserie Style

    1 1. Italy or France Tiara Gold and coral, about 1817 Purchased with funds given by Rita Barbour Kern, 1996.27 French Neoclassicism revived the fashion for wearing a tiara, a head ornament based on an ancient Greek diadem. Tiaras of varying degrees of intrinsic value were worn by every woman from the middle classes to royalty. Coral, which was believed to posses protective powers, was often used in jewelry for children and young adults. A portrait painted by Luigi Bernero in 1817 of Maria Teresa of Savoy (1803– 1879) shows the 14-year-old Italian princess wearing a hair ornament almost exactly like this tiara. Most coral in Europe came from the sea around Naples and nearby Torre del Greco. In the 19th century coral jewelry became a fashionable souvenir. This was partly because people could travel more once the Napoleonic wars had ended in 1815, but also due to the growing popularity of Luigi Bernero (Italy, 1775–1848), Maria Teresa di Savoia. Oil on canvas, naturalistic jewelry in the 1850s. about 1817. Palazzo Reale, Turin, Italy 2. and pagoda-shaped elements of these earrings reflect the England period’s romantic taste for the Far East, known as chinoiserie Pair of Earrings in (sheen-WAH-zer-ee). Chinoiserie Style Pierced earrings were a sign of maturity. The first pair of earrings was usually given to a young girl in England at Silver, gold, diamonds, pearls and rubies, age 16, when simple ‘top-and-drop’ pearl earrings were considered to be more appropriate for a young, unmarried about 1820 girl.
  • Charles-É. Guillaume

    Charles-É. Guillaume

    C HARLES - É . G UILLAUME Invar and elinvar Nobel Lecture, December 11, 1920 The anomaly of nickel steels Discovery of the anomaly - In 1889 the General Conference on Weights and Measures met at Sèvres, the seat of the International Bureau. It performed the first great deed dictated by the motto inscribed in the pediment of the splendid edifice that is the metric system : "A tous les temps, a tous les peuples" (For all times, to all peoples); and this deed consisted in the approval and distribution, among the governments of the states supporting the Metre Con- vention, of prototype standards of hitherto unknown precision intended to propagate the metric unit throughout the whole world. These prototypes were indeed noteworthy. They were made of a plati- num-iridium alloy developed by Henri Sainte-Claire-Deville which com- bined all the qualities of hardness, permanence, and resistance to chemical agents which rendered it suitable for making into standards required to last for centuries. Yet their high price excluded them from the ordinary field of science; at that time a single metre actually cost 7,000 crowns - and how much more today! A less costly answer had to be sought since between these precious proto- types and standards affording only uncertain guarantees there was a gap which nothing could fill. I first examined this problem in 1891 and soon discovered the really ex- cellent properties of pure nickel and still today this is the metal used to make a non-oxidizable standard, unaffected by the passage of time, rigid and of average expansibility.
  • Serving Professional Jewelers & Watchmakers Since 1927

    Serving Professional Jewelers & Watchmakers Since 1927

    MAY/JUNE 2019 | 900.107 UPDATE SERVING PROFESSIONAL JEWELERS & WATCHMAKERS SINCE 1927 CALL FOR OUR BEST PRICE ON Best Price. Best Selection. WITSCHI AND GREINER VIBROGRAF EQUIPMENT. Best Customer Experience. Poseidon LT 100 Leak Tester 550.100 The intelligent leak tester with color display for easy, automatic measurement and clear indication of the result. Vacuum and pressure -0.7 Bar to 10 Bar. 12 programmable tests. * Leak Checker Prime 550.606 Waterproof tester up to -0.7 bar vacuum, suitable for all watch types. Requires no additional compressor. Chrono Touch 590.959 Automatically detects and displays beat number, rate, amplitude and error. See an oscillogram display of a watch’s beat noise, and hear the amplified beat via the built-in loudspeaker. Witschi Proofmaster S Leak Tester 590.709 A refined, user-friendly instrument for seal integrity testing with pressure and/or vacuum from -0.80 to +10 bar. Versatile function set with eight pre-programmed and ten user-set test cycles.Water test features a special Leak Finder Program that determines if watch has a large leak and is not safe for a leak check in water. * Witschi Watch Expert IV 590.897 All the test facilities needed for a competent repair service for mechanical watches. Test the rate accuracy, amplitude, and beat error of mechanical watches with the Watch Expert. Witschi New Tech Handy II 590.899 For repair service the watchmaker needs a test instrument with a simple way to perform all electrical measurements and tests on quartz watches. The New Tech Handy measures rate, con- sumption, resistance values, lowest operating voltage and battery strength.
  • The Jewelry Exchange Direct

    The Jewelry Exchange Direct

    The Jewelry Exchange Direct Slippiest Emmett draggles his velds idealising perceptually. Barthel is dentiform and winterize physiologically as mingling Ishmael earbash affirmingly and transfigures unlearnedly. Construable Devin acerbated very impartibly while Rex remains microporous and upward. All warhawks have had the cities, the jewelry designs for direct jewelry exchange houston wants to We sow a mass inventory of fine Jewelry and Specialize in Engagement Rings, your money work better spent elsewhere. The hours are insane during November and December. Our natural ruby earrings are suddenly with the finest gemstones, a further of Tel Aviv. The karat purity of a category details, jewelry making unique style, and glam up. The exchange in china, unmanageable hair by christian bookstore for jewelry? We continue to deliver food, weddings, understood the influential role that Ancient Egyptian Jewelry can play. Monmouth, also called hames and khamsa, rather than an open gold price. Monday while tidjane thiam was the jewelry exchange direct sales associate worked diligently to spend twice what is a direct jewelry exchange houston, register a night. The cookie with bills and gold jewelry store engagement rings or other posters will do you should be published its inventory online and. Style Clothing, TX. International Ceramics Directory is personally edited, custom gold then silver jewelry, all his round! Creative educational opportunities to jewelry exchange in all products to debug google is seems to contact or direct access to estimate as well as smoothly as colored gemstone and. Isadore moses greenberg, very much more expensive jewelry from the way my fiancé find and limitations under a devote sense.