John Harrison (1693–1776) and Lt
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Bimetallic Strip Worksheet Answers
Bimetallic strip worksheet answers Continue The bimetallic strip consists of two different materials with different expansion ratios that are related to each other. For example, for brass and steel, linear expansion ratios: brass: 19 x 10-6/C steel: 11 x 10-6/C When this bimetallic band is heated, brass expands more than steel and strip curves with brass on the outside. If the band is cooled, it curves with steel on the outside. Bimetallic strips are used as switches in thermostats. Copper and zinc strips are the same length of 20 cm at 20 degrees Celsius (a) What will be the difference in the length of the strips at 100 degrees Celsius? b) The stripes were chained to each other at 20 degrees Celsius and formed the so-called bimetallic strip. Suppose it bends into an arc when heated. Determine which metal will be on the outside of the arc and what will be the arc radius at 100 degrees Celsius. The thickness of each band is 1 mm. t0 - 20 degrees Celsius, in which both strips are equally long l0 and 20 cm, the length of both bands is 0.20 m at t0 t. difference in length of both bands at t d 1 mm and thickness of 1'10-3 m of each band r ? The radius of the curved bimetallic strip From tables No 30-10- 6K-1 ratio of linear thermal zinc expansion NoCu 17'10-6K-1 ratio of linear thermal expansion of copper substances expands when we raise their temperature. Different substances expand in different ways, so there will be a difference in the length of the two bands. -
QUICK REFERENCE GUIDE Latitude, Longitude and Associated Metadata
QUICK REFERENCE GUIDE Latitude, Longitude and Associated Metadata The Property Profile Form (PPF) requests the property name, address, city, state and zip. From these address fields, ACRES interfaces with Google Maps and extracts the latitude and longitude (lat/long) for the property location. ACRES sets the remaining property geographic information to default values. The data (known collectively as “metadata”) are required by EPA Data Standards. Should an ACRES user need to be update the metadata, the Edit Fields link on the PPF provides the ability to change the information. Before the metadata were populated by ACRES, the data were entered manually. There may still be the need to do so, for example some properties do not have a specific street address (e.g. a rural property located on a state highway) or an ACRES user may have an exact lat/long that is to be used. This Quick Reference Guide covers how to find latitude and longitude, define the metadata, fill out the associated fields in a Property Work Package, and convert latitude and longitude to decimal degree format. This explains how the metadata were determined prior to September 2011 (when the Google Maps interface was added to ACRES). Definitions Below are definitions of the six data elements for latitude and longitude data that are collected in a Property Work Package. The definitions below are based on text from the EPA Data Standard. Latitude: Is the measure of the angular distance on a meridian north or south of the equator. Latitudinal lines run horizontal around the earth in parallel concentric lines from the equator to each of the poles. -
Latitude/Longitude Data Standard
LATITUDE/LONGITUDE DATA STANDARD Standard No.: EX000017.2 January 6, 2006 Approved on January 6, 2006 by the Exchange Network Leadership Council for use on the Environmental Information Exchange Network Approved on January 6, 2006 by the Chief Information Officer of the U. S. Environmental Protection Agency for use within U.S. EPA This consensus standard was developed in collaboration by State, Tribal, and U. S. EPA representatives under the guidance of the Exchange Network Leadership Council and its predecessor organization, the Environmental Data Standards Council. Latitude/Longitude Data Standard Std No.:EX000017.2 Foreword The Environmental Data Standards Council (EDSC) identifies, prioritizes, and pursues the creation of data standards for those areas where information exchange standards will provide the most value in achieving environmental results. The Council involves Tribes and Tribal Nations, state and federal agencies in the development of the standards and then provides the draft materials for general review. Business groups, non- governmental organizations, and other interested parties may then provide input and comment for Council consideration and standard finalization. Standards are available at http://www.epa.gov/datastandards. 1.0 INTRODUCTION The Latitude/Longitude Data Standard is a set of data elements that can be used for recording horizontal and vertical coordinates and associated metadata that define a point on the earth. The latitude/longitude data standard establishes the requirements for documenting latitude and longitude coordinates and related method, accuracy, and description data for all places used in data exchange transaction. Places include facilities, sites, monitoring stations, observation points, and other regulated or tracked features. 1.1 Scope The purpose of the standard is to provide a common set of data elements to specify a point by latitude/longitude. -
The Unilateral Twin Pivot Grasshopper Escapement
NAWCC Chapter 161 Horological Science Newsletter 2014-1 www.hsn161.com THE UNILATERAL TWIN PIVOT GRASSHOPPER ESCAPEMENT David Heskin. 16th November 2013 All currently known written, illustrated and/or physical evidence attributable to John ‘Longitude’ Harrison (1693-1776) indicates that he invented and constructed three configurations of the grasshopper escapement: (1) The twin pivot. Almost certainly the first grasshopper escapement invented by Harrison and the first to be realised in physical form within his Brocklesby Park tower clock. The entry and exit pallet arms and their paired composers are mounted upon separate pivots, located to either side of the escapement frame arbor (crutch arbor) axis. This configuration could, therefore, be referred to as a ‘bilateral twin pivot’ or ‘BTP’ grasshopper escapement. Recent analysis1 has revealed that the deliberate incorporation of matching entry and exit start of impulse torque arms and matching entry and exit end of impulse torque arms is not only possible and arguably desirable, but is also of invaluable assistance during the geometrical design process. (2) The single pivot 2. Created by Harrison for his early wooden longcase regulators and his final land-based regulator, now commonly referred to as the ‘RAS Regulator’. Optimised in his 1775 manuscript ‘Concerning Such Mechanism…’ (CSM)3 and an untitled escapement illustration, catalogued by the Worshipful Company of Clockmakers as ‘MS3972/3’. The entry and exit pallet arms and both composers share a single pivot, located on the entry side of the escapement frame arbor axis. All realistic single pivot grasshopper escapement geometries unavoidably incorporate mismatched torque arms and asymmetrical entry versus exit impulse. -
The Magazine of Corpus Christi College
8 0 0 2 s a m l e a h c i M 6 1 e u s s I The magazine of Corpus Christi College Cambridge SttuarrttLaiing PaullWarrrren CorrpussCllocck FiirrssttTellephone New Mastterr New Burrsarr unveiilled Campaiign Contents 3 The Master’s Introduction Stuart Laing, Master 4 Stuart Laing takes up Mastership 8 The Office of Treasurer appointed 10 The Corpus Clock 12 Paul Warren, Bursar 14 Nick Danks, Director of Music 16 Alumni Fund & Telephone Campaign 18 Christopher Kelly: Attila the Hun 19 Paul Mellars receives an award 20 John Hatcher: The Black Death 21 Concert dates, for Ryan Wigglesworth 22 Twenty five years of the Admission of women 26 Student summer internship 27 New Junior Common Room Editor: Liz Winter Managing editor: Latona Forder-Stent Assistant editor: Lucy Gowans Photographers: Philip Mynott Andisheh Photography (Andisheh Eslamboil m2000) Stephen E Gross: Atllia the Hun Jeremy Pembrey: Corpus Clock Alexander Leiffheidt ( m2001): John Hatcher Greg E J Dickens: Chapel Organ Dr Marina Frasca-Spada Nigel Luckhurst: Ryan Wigglesworth Manni Mason Photography: Paul Mellars Jet Photographic Eden Lilley Photography Occasional Photography Produced by Cameron Design & Marketing Ltd www.cameronacademic.co.uk Master’s Introduction Dear Alumni and friends of Corpus, Gerard Duveen 4 March 1951 – 8 Nov 2008 I write having taken up the Mastership just three weeks ago. I am naturally delighted – and honoured – The Master and Fellows of Corpus Christi are to be here, at a desk looking out into New Court where sad to announce the death of Dr Gerard so many of my distinguished predecessors have Duveen, Fellow of the College and Reader in sat before. -
GMT and Longitude by Lunar Distance: Two Methods Compared from a Practitioner’S Point of View
THE JOURNAL OF NAVIGATION (2019), 72, 1660–1664. c The Royal Institute of Navigation 2019 doi:10.1017/S0373463319000341 FORUM GMT and Longitude by Lunar Distance: Two Methods Compared From a Practitioner’s Point of View Eric Romelczyk (E-mail: [email protected]) This article discusses the technique of observing lunar distance - that is, angular distance between the moon and another celestial body - to establish universal time and longitude, from a practitioner’s point of view. The article presents a brief overview of the principles underlying the lunar distance observation and its use in celestial navigation. A discussion follows of two different methods for finding universal time by observing lunar distance, Dr. Wendel Brunner’s calculator-based method and the specialised inspection tables created by Bruce Stark. The article compares the two methods against each other for ease of use and accuracy. The author concludes that either method will provide satisfactory results, but that the technique of observing lunar dis- tance is unlikely to regain relevance in the modern-day practice of navigation and is primarily useful as a skill-building exercise in making sextant observations. KEYWORDS 1. Navigation. 2. History. 3. Nautical. 4. Time. Submitted: 8 August 2018. Accepted: 14 April 2019. First published online: 2 May 2019. 1. INTRODUCTION. 1.1. History of the lunar distance method. For centuries of seafaring history, a method for accurately measuring time to the degree of precision necessary to establish the navigator’s longitude was out of reach for practical purposes. It had been understood since the mid-16th century that the navigator’s longitude could be established either by reference to the moon’s angular distance from other celestial bodies - the “lunar distance”, measured by careful sextant observations - or by reference to a timepiece of sufficient accuracy. -
Tranquility Clock Kit and Plan Manual
The Tranquility Clock Copryight © 2014 Jeffrey A. Schierenbeck Introduction For hundreds of years, mechanical clocks have served as functional timekeepers. During that time, clocks have also been treasured for their artistic and aesthetic value. For most clocks, the artistry involves the shape and ornamentation of the clock’s exterior case. However, these cases hide the inner beauty of the clock–the clockwork mechanism. The Tranquility clock is a wooden gear clock that is a functional timekeeper with an open frame which exposes its mechanical elements. All the moving parts are clearly visible. It is intriguing to watch as the seconds and minutes tick away. Of particular interest is its ‘grasshopper’ escapement. It is based on the famous escapement which was developed by John Harrison. In the late 1700's, Harrison devised the grasshopper escapement in his quest to make an accurate, seaworthy clock and claim the “Longitude Prize”. The goal of his articulated escapement was to eliminate sliding friction at the pallets, which was a significant source of error in the days when effective lubrication had not been developed. It is enjoyable to see and hear this clock running. However, the most enjoyable part of this clock is the satisfaction gained by assembling the clock yourself, perhaps adding your own creative touches. And, through the process of building the clock, you will gain an understanding of the principles that govern how a clock works, including the operation of the unique grasshopper escapement. We truly hope you enjoy building your clock. Please contact us if there is any way that we can help you with your clockmaking project. -
THE LONDON GAZETTE, JANUARY 28, 1870. 547 Tiie Date of Such Patents, Pursuant to the Act of York, United States of America.—Dated 19Th the 16Th Viet., C
THE LONDON GAZETTE, JANUARY 28, 1870. 547 tiie date of such Patents, pursuant to the Act of York, United States of America.—Dated 19th the 16th Viet., c. 5, sec. 2, for the week ending January, 1867. the 22nd day of January. 1870. 143. William Bull, of Qualit3"-court, Chancery- 115. John Davies, of No. 24, Ludgate-hill, in the lane, in the county of Middlesex, Civil Engineer, city of London, and Arthur Helwig, of No. 73, for an invention of " improvements in glass Old Kent-road, iu the county of Surrey, En- blowing, and in apparatus therefor."—Commu- gineer, for an invention of "improvements in nicated to him from abroad by Leon Bandoux, the permanent way of railways."—Dated 16th of Charleroi, in the Kingdom of Belgium.— January, lb'67. Dated 19th January, 186/1 116. William Howavlh, Dentist, and Mason Pear- 144. Thomas Willis VVilJin, of Clerkenwell-grcon, son, Overlooker, both of Bradford, in the in the county of Middlesex, for an invention of county of York, and John Pearson, of Thorn- '• improvements in the manufacture of watch ton, in the same county, Jaequard Harness cases, and in apparatus employed therein."— Maker, for an invention of " improvements in Dated 19th January, 1867. Jacquard engines." — Dated 17th January, 147. Robert Harlow, of Heaton Norris, in the 1867. county of Lancaster, Brass Founder, for an in- 119. Ernst Silvern, of Halle, in the Kingdom of vention of " improvements in. the construction Prussia, Architect, for an invention of |S an im- of wash-basins and apparutus for supplying hot proved mode of and apparatus for purifying the and cold water to the same, which improvements impure, waters emanating from sugar-factories are also applicable to apparatus for supplying and oilier industrial establishments applicable water to baths and other similar receptacles."— also to the purification of sewage water."— Dated 21st January, 1867. -
John Taylor Contents
John Taylor Born 1936. Philanthropist, horologist, and inventor of thermostatic electric kettles. Autobiographical life story. Available online at www.livesretold.co.uk Contents 1. Life 2. Inventions 3. Passions 4. Business Life 5. Philanthropy 6. Art & Design 7. Horology & Clocks 8. Science & Engineering 9. The Corpus Chronophage 10. The Midsummer Chronophage 11. The Dragon Chronophage 12. Chronophage Commissions 13. Publications 14. Arragon Mooar 15. A Personal Tribute This life story was archived in 2021, with acknowledgement and thanks, from Dr. John Taylor's website at www.johnctaylor.com. Where additional internet material has been added the source is acknowledged. 1 1. Life I was lucky to be able to study Natural Sciences at Corpus Christi College at Cambridge University. I remember thinking I was very smart at school – until I got to university – when I realised that there were a lot of people much smarter than me! However, after a long career, I’m now immensely proud to be considered one of Britain’s greatest inventors. I returned to live on the Isle of Man 40 years ago after running the highly successful Otter Controls business in Buxton, Derbyshire. Many of the hundreds of patents that I hold are for domestic appliances, thermostats and electrical equipment. Probably my most famous invention is the thermostat controls for the cordless kettle, patented and used throughout the world. It’s been calculated that over two billion of my bi- metal blades – used in thermostats to switch off kettles – have been produced since their invention in the 1970s. Strix, a company I founded, now holds four Queen’s Awards, three for Export and one for Innovation, granted for my 360-degrees cordless kettle connector. -
Celestial, Flow, and Mechanical Clocks
recalibration Michael A. Lombardi First in a Series on the Evolution of Time Measurement: Celestial, Flow, and Mechanical Clocks ime is elusive. We are comfortable with the concept of us are many centuries older than the first clocks. The first -in time, but in many ways it defies understanding. We struments that we now recognize as clocks could measure T cannot see, hear, or touch time; we can only observe intervals shorter than one day by dividing the day into smaller its effects. Although we are unable to grasp time with our tra- parts. ditional senses, we can clearly “feel” the passage of time as we Most historians credit the Egyptians with being the first civ- watch night turn to day, the seasons change, or a child grow up. ilization to use clocks. Their first clocks were probably nothing We are also aware that we can’t stop or reverse the continuous more than sticks placed in the ground that indicated time by flow of time, a fact that becomes more obvious as we get older. both the length and direction of their shadow. As early as 1500 Defining time seems impossible, and attempts to do so by phi- BC, the Egyptians had developed a more advanced shadow losophers and scientists fall far short of their goal. clock (Fig. 1). This T-shaped instrument was placed in a sun- In spite of its elusiveness, we can measure time exception- lit area on the ground. In the morning, the crosspiece (AA) was ally well. In fact, we can measure time with more resolution set to face east and then rotated in the afternoon to face west. -
Harrison's Wooden Clock At
Harrison’s Wooden Clock at 300 A Visit to Nostell Priory Eve Makepeace o celebrate the 300th birthday of their John Harrison T wooden clock, Nostell Priory, wanted to really put it in the spotlight. They have certainly achieved that and widened its appeal to old and young alike. For many years the clock has stood in a fairly unassuming spot within the Priory where only the eagle-eyed would realise its importance. That has all changed and the clock, one of only three surviving wooden examples by Harrison, is now at the centre of a new exhibition celebrating his skill in the place where he was born. In a custom-made display, the clock is shown without its case to highlight the beautiful wooden parts, lighting drawing the eye to the delicacy of the piece, Figure 1. Alongside the clock, visitors can also watch a specially commissioned film about Harrison and view a series of displays which celebrate his work. These include a rarely seen section of the original case, complete with calculations in Harrison’s own hand, kindly loaned by The Worshipful Company of Clockmakers. In a breakaway from the long-held assumption that National Trust properties are ‘look but don’t touch’, there are the parts of a clock displayed in a way that they can be held, examined and appreciated, Figure 2. Of particular interest to me, especially in these times of questioning ‘Conservation or Preservation?’, there is a board asking for input from visitors on their thoughts regarding the care and preservation Figure 1. of the clock. -
John Harrison (1693-1776) and the Heroics of Longitude
DOI 10.6094/helden.heroes.heros./2014/02/09 Ulrike Zimmermann 119 John Harrison (1693-1776) and the Heroics of Longitude 1. A Symposium and a Rediscovery bestseller, and Dava Sobel embarked on a car eer as a wellknown and respected author of 2 When American journalist Dava Sobel attended popular science books. the Longitude Symposium of Harvard Univer Dava Sobel’s first subject already was his sity at Cambridge, Massachusetts, in November tory, albeit part of an unaccountably hidden or 1993, she did not expect anything decisive to at least underrated history. John Harrison was a come out of either the conference or her attend carpenter and selftaught clockmaker, who was ance. “500 people from seventeen countries” born in Yorkshire and spent his early life in Bar came together to hold “a conference about the rowuponHumber, North Lincolnshire. He would history of finding longitude at sea,” W. H. An prob ably have spent his life in obscur ity had he drewes, curator of the scientific instruments col not solved one of the major techno logical prob lec tion at Harvard, notes in his introduction to lems of his time, the problem of how to determine the conference proceedings (Andrewes, Intro a ship’s eastwest position, its longitude, at sea. duction 1). Despite the sizable number of par Harrison has a firm place in the his tory of navi ticipants, the Longitude Symposium was at first gation, and would have been known amongs t sight a convention of specialists sharing their horologists, clock and watch makers, and nava l knowledge and discussing finer points of their historians.