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COLORADO SCHOOL OF MINES cy^AGAZINE Volume 10 No. 4 ^ April 1930 Back in 1923, tlie New Cornelia Open End Rod Mills, the shells of Copper Company of Ajo, Arizona, their mills were lengthened by three installed their first battery of Marcy feet which resulted in an immediate Open End Rod Mills. The installation increase of 25% in grinding capacity. t •Sir" consisted of twenty 6' x 12' units. In 1929, favorable metal prices dic­ li. tated a further increase in grinding These Marcy Open End Rod Mills capacity, and their previous exper­ prepared hard copper ore of %" size ience and complete satisfaction with for selective flotation. The manage­ Marcy Open End Rod Mills caused ment was pleased with their grinding them to order twelve more units, efficiency and high operating time. which are now being installed. In 1928, this company wanted greater You, too, may profit from their exper­ capacity quickly and at low cost and ience. Get the facts by writing for due to the simple design of Marcy Bulletin No. 73. INEandQMELTER WPOf v3 C®MBMfY MARCY MILL DIVISION DENVER, COLORADO, U. S. A. EL PASO,TEXAS NEW YORK CITY SALT LAKE, UTAH 410 San Francisco St. 225 Broadway 121 West 2nd,Soutli ifiii I NO VIBRATION TRANSMITTED The TRAYLOR Vibrating Screen Supreme is constructed to handle a full load, running at top speed without transmitting any vibration to the screen supports or building* You should see one of these screens in opera­ tion, they are sturdy, compact and require less at­ tention with full surface vibration insuring more profit at least cost. Write our engineers for information, they are always glad to help with screening problems. ELECTRICALLY DRIVEN 1400 Delgany St. THE TRAYLOR VIBRATOR CO. Denver, Colo. You owe it to your workmen and yourself to place a RED CROSS sign at each first aid room or station in your mine or factory. First STONEHOUSE—Danger, Saftey First, Direction, Notice, Caution, and Be Careful signs are standard as to color and design. They Aid TIME-THAT TOUGH OLD TESTER-FINDS are approved by the leading safety engineers and authorities. A FOE THAT FIGHTS HIM OFF Play Safe With Stonehouse Signs Many generations ago. Time—That Toush Old Tester—began his fight with genuine puddled wrought iron. Against that sturdy metal of which Reading 5-point pipe is made. Time first used his most potent weapon, For /our Protection, corrosion. This Indented Spiral Forever Marks Year after year after year. Time poured his corrosive mixtures over and HOSPITAL •# LABTORYl through 5-point pipe trying to set in action the destruction which men call rust. But no loop-holes could Time find—filaments of silicious slag barred the way. Only pipe made of genuine puddled wrought iron has DESCRIPTION PRICES ON SIGNS ILLUSTRATED ABOVE 30-gauge 20-gau3e proved that it can thus fight off the test of Time—the only conclusive Red Crpss signs are 3J^"xl4" in size, colors as I sign - .60 $ .80 shown. On blank panel sign No. 1600 we can im­ 6 signs of same wording 40 each .60 each pipe test known. 12 signs of same wording 36 each .52 each print specikl copy at additional cost over prices listed 25 signs of same wording .32 each .44 each for stock signs in opposite column. 50 signs of same wording 28 each .40 each Make your first cost of pipe the last cost, avoiding damaging leaks, by Insisting on Reading genuine puddled wrought iron pipe. READING IRON COMPANY, Reading, Pennsylvania SIQNB. INC. GENUINEEADIN PUDDLED CWROUGH TPIP IRON t R DIAMETERS RANOINO FROM I/O TO 20 INCHES Wlicn Palronizins Advertisers Please Mention Colorado School of Mines Masazine Science and Invention Have Never Found a Satisfactory Substitute for Genuine Puddled Wrought Iron ARTHUR C. DAMAN, '15 FRANK E. BRIBER, '16 Takes less ''pull'' than Your Choice of a politics Summer Scliool TIj'ASY on power— ' more tonnage hauled in less time. That's one way the First: The summer school you choose Card Improved Roll­ should be the school that specializes DENVER PORTABLE MILLS er Bearing Wheels on in teaching what you want to be Mills are built in 25, 50 and 100- mine cars cut costs. ton capacities with all standard taught. equipment such as Crusher (Shown Another thing is economical upkeep. Ex­ at the top). Steel Bin, Feeder, Ball Second: The summer school you choose treme simplicity of design means fewer work­ Mill, Conditioner, Classifier, Flota­ ing parts. Dirtproof—increased long life, and should be the school that is located tion Machine and Pilot Table. Can economical lubrication. Try a few and watch in a pleasant summer climate, con­ be assembled or torn down in two days. 'em! ducive both to good health and study. Write for complete information DENVER EQUIPMENT CO. C • S • Card Iron Works The Colorado School of Mines, 14/9 I7t/iStreet-^Denver, Colorado. Telephone MAin 4315 DENVER A Summer School for Engineers— Cable "DECO At the very entrance to the Denver Mountain Parks, and only twelve miles from the City itself, Golden, the home of the School of Mines, offers to the summer student the advantages of outdoor recreation and the diversions to Economy in Mineral Exploration be found in a large city. means practical application of The Colorado School of Mines, A Pleasant Place for Summer Study— Geophysical Instruments Engineering students who wish to make up work or gain advanced standing during the summer are invited to Askania Geophysical instruments have been suc­ write for the Summer Session Bulletin. High School cessful in assisting geologists and mining engineers to locate iron, copper, zinc, lead, coal and salt deposits graduates deficient in entrance requirements demanded in many districts throughout the world. They re­ by engineering schools can make up such deficiencies move doubt, eliminate unprofitable borings and speed during the summer. up exploration work. They have proved through the test of time the accuracy of their analysis. We are making and selling for geophysical work: Eoetvoes torsion balances with photographic and visual reading (large and small Come to Cool Colorado types), magnetometers, seismographs and other scientific instruments. to Study! For particulars write for information regarding the Summet School for Engineers, write the American Askania Corporation DIRECTOR OF THE SUMMER SESSION, at CoUlen. Colo. 1024 Marine Bank Bldg., Houston, Texas When Patronizing Advertisers Please Mention Colorado School ot Mines Magazine ARTHUR C. DAMAN, '15 FRANK E. BRIBER, '16 Takes less ''puir' than Your Choice of a politics Summer School "DASY on power— ' more tonnage hauled in less time. That's one way the First: The summer school you choose Card Improved Roll­ should be the school that specializes DENVER PORTABLE MILLS er Bearing Wheels on in teaching what you want to be Mills are built in 25, 50 and 100- mine cars cut costs. ton capacities with all standard taught. equipment such as Crusher (Shown Another thing is economical upkeep. Ex­ at the top). Steel Bin, Feeder, Ball Second: The summer school you choose treme simplicity of design means fewer work­ Mill, Conditioner, Classifier, Flota­ ing parts. Dirtproof—increased long life, and should be the school that is located tion Machine and Pilot Table. Can economical lubrication. Try a few and watch in a pleasant summer climate, con­ be assembled or torn down in two days, 'em! ducive both to good health and study. Write for complete inforination DENVER EQUIPMENT CO. /4/9 i^th Street •< Denver, Colorado, C • S • Card Iron Works The Colorado School of Mines, DENVER Telephone MAin 4315 A Summer School for Engineers— Cable "DECO At the very entrance to the Denver Mountain Parks, and only twelve miles from the City itself. Golden, the home of the School of Mines, offers to the summer student the advantages of outdoor recreation and the diversions to Economy in Mineral Exploration be found in a large city. means practical application of The Colorado School of Mines, A Pleasant Place for Summer Study— Geophysical Instruments Engineering students who wish to make up work or gain advanced standing during the summer are invited to Askania Geophysical instruments have been suc­ write for the Summer Session Bulletin. High School cessful in assisting geologists and mining engineers to locate iron, copper, zinc, lead, coal and salt deposits graduates deficient in entrance requirements demanded in many districts throughout the world. They re­ by engineering schools can make up such deficiencies move doubt, eliminate unprofitable borings and speed during the summer. up exploration work. They have proved through the test of time the accuracy of their analysis. We are making and selling for geophysical work: Eoetvoes torsion balances with photographic and visual reading (large and small Come to Cool Colorado types), magnetometers, seismographs and other scientific instruments. to Study! For particulars write For information regarding the Summer School for Engineers, write the American Askania Corporation DIRECTOR OF THE SUMMER SESSION, at Golden, Colo, 1024 Marine Bank Bldg., Houston, Texas When Patronizing Advertisers Please Mention Colorado School of Mines Masazine THE LOWDEN DRYER FOR FLOTATION CONCENTRATES A Lowden Patent Dryer will enable you to ship dry con­ IS STANDARD THE WORLD OVER centrates. It will save you freight losses due to shipping water. With the Lowden Dryer you can reduce the moisture content as low as desired. Most important of all, it dries without dusting, and therefore absolutely without dust losses. The Lowden dries those sticky, troublesome concentrates—which formerly caused so much extra labor —both rapidly and efficiently. A Lowden Dryer following a Rotary Filter forms a per­ fect combination for the finishing of concentrates. There is no clogging or balling. The dried material is delivered in ideal condition for smelter treatment.

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