Graduate and Student Notes.

(Continued from page 66)

Louis K. Siegmund, of Turner, Oregon, holds the responsible position of Chief Engineer at the Oregon State Reform School, Salem, Oregon, to which position he was promoted last May, after acting as assistant engineer for the

L. K. SIEGMUND.

last two years. He now has charge of a heating plant, consisting of two 65-H. P. boilers, one 65-H. P. steam boiler, and an Atlas automatic engine; also one 6H. P. portable boiler and engine and one 2-H. P. boiler used for heating water at the slaughter house.

Otto F. Tirmenstein, who completed the course in Stationary Engineering in May, 1903, is foreman of the Concordia Publishing Company of St. Louis, Missouri.

Harry Gibler, after finishing the Electrical course, directed the construction of the Rifle Telephone Company's independent line at Buford, Colorado, and installed their switchboard.

Joel C. Garrison, formerly of Breckenridge, Texas, is now assistant engineer in the State Lunatic Asylum at Austin, and has entire charge of the engine room. The plant consists of three tubular boilers, rated at about 100 H. P. each, and the fuel is Beaumont oil. We quote from a letter of P. J. Kean, Bellows Falls, Vermont, a graduate in the Electrical course:

"I wish that I could impress upon the minds of the industrious young men who are kept behind through want of proper technical training the boundless possibilities before them in this broad land of ours, if they only could know the bene

fits to be derived from a complete and up-to-date system of technical education."

M. S. Leonard holds the position of draftsman with the B. F. Sturtevant Company of Boston. Mr. Leonard has succeeded in spite of difficulties which would have discouraged many a man. When he was a boy he met with an acciIdent in which he lost his left hand, but this misfortune did not prevent him from preparing himself to occupy a useful position in the industrial world.

was designed and manufactured by Compton & Company. The above is a picture which Mr. Treeby took while charging the battery.

We quote the following from a letter of S. W. Houghton, of Springfield, Mass:

"When I began my studies my only object was to amuse myself evenings, but I soon found that I was more than amusing myself; I found that I was getting a good, sound education. I would not have believed it possible that anyone could learn by mail what I have. It helps me in my business and in my reading, for I can now understand books and papers that were blank to me before." (Continued on page 84)

Student and Graduate Notes.

(Continued from page 82) W. D. Eiler, of Lebanon, Pennsylvania, has been employed by the Keystone Match and Machine Company of that city for the last seven years, and for three years has had charge of the entire plant.

Louis N. Leeper, formerly of Collinsville, Texas, has moved to Ardmore, Indian Territory, where he has accepted a position with the Whaley Mill and Elevator Company.

C. Richard Ward, of Rockland, Maine, is in charge of two 124-H. P. boilers and a Webster "Star Vacuum" Steam Heating System for the Thorndike Hotel in that city.

on a

George C. Hanson sends a greeting from Auckland, New Zealand. He is at present employed as fireman steamer plying between Auckland and neighboring ports, and spends all his leisure on his correspondence work.

Lewis E. Day, of New Haven, Connecticut, who was a machinist's apprentice when he began to study, writes that he is now taking contracts at the average of $4.00 a day.

Ernest Brunner, Johannesburg, South Africa, is with the South African General Electric Company, which has a large repair shop at that place and does a

great deal of winding and construction. work. The above is a picture of Mr. Brunner and a three-phase machine which he wound.

some radiographs with X-rays and performed experiments with the "Tesla Currents." He sends us a picture of the Cascade de Texolo, where the power plant for Jalapa and Coatepec is situated. Linus Kedney, another correspondence student, is employed in this plant.

We quote the following from a letter of Ernest S. Pike:

"I am at present holding the position of second engineer on the New Zealand government steamer 'Hinemoa,' a vessel of 300 tons register, having one set of compound engines. The vessel is engaged principally in light-house work around the coast of New Zealand, thirtytwo lights in all. We pay an annual visit to outlying islands in order to replenish depots, which the government has erected for the use of castaways. I started course in marine engineering last January with the view of preparing my(Continued on page 88)

a

We are issuing this book at a price which places it within the reach of everybody, that they may be convinced of the practical value of our instruction. A copy will be sent, for one dollar and thirty-five cents, to every person giving us the name of two friends interested in Electrical, Mechanical, Civil Engineering, Textiles or Architecture. Address Room 137K.

The book is easily worth $3, containing as it does the general principles of Electricity, as applied to Electric Vehicles and Launches, the Telephone, the Telegraph, Storage Batteries, etc., and Wiring as required by the National Board of Underwriters.

We make this liberal offer simply to prove what the School has done and is doing day by day in the work of fitting young men for responsible and profitable positions.

Partial table of contents:

STORAGE BATTERIES (by Prof. E. B. Crocker. Columbia University): Types; General Principles; Chemical Action; Data Sheets; Edison Storage Battery; Management; Electrolyte; Cadmium Test; Charging; Efficiency; Troubles and Remedies; Testing; Portable Batteries for Automobiles and Boats, etc.

ELECTRIC WIRING (by H. C. Cushing, Jr., author of Standard Wiring'): Dynamo Installation; The Switch Board; Lightning Arresters; Motor Installation; Tables; Transformers; Three Wire Systems; Poles and and Pole-Setting; Inside Wiring; Arc Light Wiring; Conduit Work; Fixture Wiring; Cut Outs; Switches; Distribution of Light; Arc and Incandescent Systems; Fuses; Inspection, etc.

ELECTRIC CURRENT (by L. K. Sager, S. B.): Volt, Ampere, Ohm; Resistance, Conductivity; Tables; Circuits, Grouping of Cells; Quantity; Energy; Power; Coulomb; Joule; Watt, etc.

ELEMENTS OF ELECTRICITY by L. K. Sager, S. B.): Magnets, Experiments with Magnets; Magnetizing Steel; Conductors and Insulation; Electric Machine, Leyden Jar; Voltaic Cell; Types of Cells; Electromagnets; Induction Coil; Electrolysis; Electrotyping and Electro-Plating; The Telephone; The Telegraph; Sounder, Alphabet, Key, Battery, Relay, etc. AMERICAN SCHOOL OF CORRESPONDENCE

AT

ARMOUR INSTITUTE OF TECHNOLOGY, CHICAGO, ILL.

Louisville Man Originates a Simple Little Device That Instantly Restores the Hearing Fits Perfectly, Comfortably, and Does

Not Show.

190-Page Book Tells All About It

Since the discovery of a Louisville man it is no longer necessary for any deaf person to carry a trumpet, a tube, or any such old-fashioned device, for it is now possible for any one to hear perfectly by a simple invention that fits in the ear and can not be detected. The honor belongs to Mr. George H. Wilson, of Louisville, who was himself deaf and now hears as well as anyone. He calls it Wilson's Common Sense Ear Drum, is built on the strictest scientific principles, containing no metal of any kind, and is entirely new in every respect. It is so small that no one can see it, but, nevertheless, it collects all sound waves and diverts them against the drum head, causing you to hear perfectly. It will do this even when the natural ear drums are partially or entirely destroyed, perforated, scarred, relaxed or thickened. It fits any ear childhood to old age, and, aside from the fact that it does not show, it never causes the hearer irritation, and can be used with comfort day or night.

It will cure deafness in any person, no matter how acquired, whether from catarrh scarlet fever, typhoid or brain fever, measles, whooping cough, gathering in the ear, shocks from artillery, or through accidents. It not only cures, but stays the progress of deafness and all roaring and buzzing noises. It does this in a simple, sure, and scientific way. The effect is immediate.

Let every person who needs this at once send to the company for its 190-page book, which you can have free. It describes and illustrates Wilson's Common Sense Ear Drums and contains many bonafide letters from numerous users in the United States, Canada, Mexico, England, Scotland, Ireland, Wales, Australia, New Zealand, Tasmania, India. These letters are from people in every station in life-clergymen, physicians, lawyers, merchants, society ladies, etc. and tell the truth about the benefits to be derived from the use of this wonderful little device. You will find among them the names of people in your own town or state, and you are at liberty to write to any of them you wish and secure their opinion as to the only scientific ear drums for restoring the hearing to its normal condition.

Write today and it will not be long before you are again hearing. Address for the free book and convincing evidence, Wilson Ear Drum Co., 1552 Todd building, Louisville, Ky.. U.S. A.

WANTED-Four young men, good habits, thrifty and industrious; versed in the working and tempering of steel. Address The Technical World, No. 42.

It is easily seen that this is the same result as that obtained by finding the velocity ratio of each pair separately. The velocity ratio of L and A is

70

5.

14

104

=8;

13

75

That of M and B is

and of N and C

These ratios multiplied together give 5X8X5200.

Let us imagine a drum 2 feet in diameter on the shaft to which the gear N is keyed. If the power is applied to the gear A, which makes 1,000 revolutions per minute, how far will a weight be raised per minute by the drum?

Since the velocity ratio of the train is 200, the drum will make 1,000÷200=5 revolutions per minute.

The circumference of the drum is 3.1416X26.2832 feet; and as the drum revolves 5 times per minute, the weight will be raised 5X6.283231.416 feet per minute.

By this means the trains for electric cranes and all kinds of geared hoisting machinery, as well as the gears for drills and lathes, may be figured.

The calculation usually differs from the above, in that the final velocity is known, and the gears must be chosen to give that velocity ratio. The same principle, however, applies in either case.

These rules for gears may be used for belting by substituting the diameter of the pulley for the number of teeth.