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THE VERANT IN USE, ALLMETAL +ADD TO +
MODEL YOUR SUCCESS
graphic objective; and, on the other 00
hand, the lens is free from any deforma8a etime now wasted in adding
tion for a diaphragm distant 27 millilong columns by using
meters (1.06 inches) from the nearest lens THE LOCKE ADDER.
surface, the rotating center of the obIt minimizes time, expense and drudgery of business details. 'Adds, subtracts, multiplies
serving eye having to be placed at that and
divides. Capacity, 999,999,999. 'Cannot make a mistake. One of the fastest adding machines
point. made. No complicated mechanism to get out of
These different conditions will result order; no expert repair man's bills to pay; no breaks cause delay and inconvenience. Ready to use any time,
in a normal eye view instead of the small any place. Simple, light, handy. Size, 4x10% inches. All metal. Price, $5.00, prepaid in U.S. Send
photograph, a distant image of the latBuy
for FREE descriptive booklet. Agents wanted. a Locke
ter being free from any deformation (if C. E, LOCKE MFG. CO., Adder to 32 Walnut Street, Kensett, Iowa.
the eye be placed at the point of no deSave Your Brain.
formation), and fulfilling the same conditions as to apparent size, shadows, and relative distinctness as in the case of the objects being inspected from the objective of the photographic camera. The im
pression thus produced by the small is the largest and the most important number of a photograph will be much more true to power plant paper ever issued. The price of a single copy to non-subscribers, is
nature; and the main consequence will 50 cents. Subscribe now, send us one dollar, and you be an unconscious production of a true will receive the New Year's Number and 23 other numbers during 1905.
image agreeing with the different marks Let us tell you how you can make money by getting new subscribers. One Dollar a Year. Issued
observed. The photograph as observed twice a month. Write for free sample copy.
through the apparatus will therefore proThe Engineer Publishing Company duce quite as plastic effects as in the case 357 Dearborn Street Chicago, Illinois of being regarded with both eyes through
a stereoscope.-DR. A. GRADEN WITZ. Mention The Technical World.
HERE'S A FEW OF THE PARTS NAMED-THERE ARE 497 IN ALL. 22-12-inch guns.
278—Refrigerating room. 23--Sighting hoods-11-inch armor.
291-Crew's hammocks. 41-Conning tower-9-inch armor.
313-Broadside torpedo tubes. 42-Rapid fire guns-1 pounders.
3:20 - Submarine mines, 63-Upper fighting top.
336-12-inch shells. 69A --Code signal-*We can defend ourselves."
344-Upper dynamo room, 70A-Speed cone-"Full speed ahead."
358-Exhaust air from dynamo room. 193-6-inch guns.
Mention The Technical World.
Just Ready-Centrifugal Fans, by J. H. KinealY.
M. Am. Soc. M. E. Dealing with their designing, construction and use with numerous Formulas, Illustra
Dry Battery-Electro-Gilding Bath tions and Tables. Suitable for archi
Question 1: How can I make a pocket dry tectural and engi
battery? neering drawings.
Question 2: How can I make an electro
gilding bath which gives a red color like 14SYSTEM 8 NEW
or 18-carat gold?-. V'. C. ALPHABETS.
Answer 1: Dry cells are sold at such Вү
a low price that it does not pay an indiJ.H.CROMWELL
vidual to spend his time in the manufactNinth Thousand.
ure of a cell. A dry battery may be By Mail 50c.
made in the following manner: Care and Handling of Electric Plants.
A jar of the desired shape is made of With very useful table, formulas and suggestions and 66 original drawings.
zinc; heavy sheet zinc should be used In limp leather Price $1.00
and bent into the required form, then
soldered in such a manner that it forms Spon & Chamberlain a jar. It will be found difficult to solder Publishers TECHNICAL BOOKS
zinc. All parts where it is desired the T. W., Liberty Building,
solder should stick should be carefully NEW YORK
cleaned by scraping, and clean chloride of zinc used as a flux. The zinc should have a brass binding-post soldered to it. The other electrode is usually carbon,
and should have a similar binding-post Twentieth Century
fastened to it.
The contents of such cells vary. In Locomotives
Gassner's cell, the following mixture is
used: ANGUS SINCLAIR COMPANY
Oxide of zinc, i part by weight; sal-ammoniac, 1 part; plaster of paris, 3 parts; chlo
ride of zinc, i part; and water, 2 parts. Newly Published and is the
The cell is sealed by means of covering Best Book on
with pitch, or some similar material Railway Machinery
which will not allow salts to creep. There ever published. Contains
are many other formulæ for the contents chapters on: Elementary
of the cell, which are used with success. lessons on first principles; steam and motive power;
Answer 2: The following solution, workshop operations; loco
recommended for red plating, should be motive boiler construction;
used hot (at the boiling point) with a compound locomotives;
platinum wire for the anode and with valve motion; machine tools and shop appliances, and
high current density: on nine other subjects.
Phosphate of soda (crystallized), 60 parts; PROFUSELY ILLUSTRATED.
bisulphite of soda, 10 parts; cyanide of potasContains 670 pages, 6x9 inches.
sium (C. P.), I or 2 parts; neutral chloride PRICE, THREE DOLLARS
of gold, 2 parts; distilled or rain water, 1,000
parts. LOCOMOTIVE ENGINEERING First dissolve the phosphate of soda in
800 parts of hot water. When thoroughly Department T, 136 Liberty Street
dissolved, filter the solution if not clear, NEW YORK
and allow to cool. Dissolve the gold
chloride in 100 parts water, and the biMention The Technical World.
Compendium of Drawing
A COMPLETE CYCLOPEDIA
For the Library, the Shop, the Student
900 Pages-1,000 Illustrations, Folding Plates, Etc.
REGULAR price, $10.00, reduced nearly
one-half in order to introduce the Size 8 x 10
work. No more comprehensive treatise on inches
drawing ever published. $25.00 would not
buy separate volumes covering the subjects. Practical test questions combine the advantages of a text-book with a Cyclopedia of Drawing.
OSWALD GUETH, M. E., Consulting Engineer, Technical Editor of "Cold Storage
NOT GOOD AFTER FEBRUARY 28th
BOTH VOLUMES sent free on approval (express prepaid). Keep them five days. If satisfactory send $1.00 and $1.00 per month for five months thereafter. Otherwise notify us and we will transfer them absolutely free. They have a permanent utility that makes them a desirable acquisition to every library.
LIST OF AUTHORS AND SUBJECTS
Part I PROF. E. KENISON, M. I. T.
Mechanical Drawing PROF. H. W. GARDNER, M. I.T.
Shades and Shadows PROF. D. A. GREGG, M. I. T.
Rendering in Pen and Ink PROF. W. H. LAWRENCE, M. I. T.
Mechanism PROF. C. L. GRIFFIN, formerly Pa. State College Machine Design WM. NEUBECKER, N. Y. Trade School, Sheet Metal Pattern Drafting
.....CUT OFF HERE.. American School of Correspondence, Chicago:
Please send me free, on approval (express prepaid), one Compendium of Drawing, as advertised in The Technical
AMERICAN SCHOOL OF CORRESPONDENCE
CHICAGO, ILL., U. S. A.
St. and No..............................
Mention The Technical World.
KEROSENE OIL ENGINE
Stationary, Marine, Portable. Send for Catalog. Int'l Power Vehicle Co., 379-81 Dearborn St., Chicago
ADDS MULTIPLIES ETC.
CORRECT ADDITIONS MAKE EMPLOYEES
SERVICES VALUABLE. WRITE FOR CATALOGUE NO II AND IO DAY FREE TRIAL THE MORSE EWALSH CO., TRENTON, N.J.
Answer: The pressure at any crosssection of the pipe can be determined by multiplying the head in feet at that section by the factor 433. The greatest pressure on the first 300 feet length of pipe will be that due to the head of 18 feet. This corresponds to a pressure of 7.8 pounds per square inch. The greatest pressure on the last section will be that due to the total head of 55 feet, and is equivalent to 23.8 pounds. By use of the following formula, the neces
3 Months Free
Months Free Sary thickness of the tube can be de
If you are interested in any kind of investment,
Bonds, Mortgages, etc., send us your name and address and we will send you The Investor's Review for three month free of charge. A journal of advice for investors. Gives latest and most reliable information concerning new enterprises. Knowledge is power. Great opportunities come and go. Great fakes likewise. Get posted before investing Write to-day. ISVESTOR'S REVIEW, 1580 Gaff Bldg., CHICAGO, ILL
in which t is the thickness in inches ; D, the diameter in inches (96);P, the press
Mention Tlie Technical World,