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NFW ELECTRIC DANGER SIGNAL. Bell and lights as they appear at a grade crossing.

NEW ELECTRIC DANGER SIGNAL. Controlling device as it appears at side of rail.

The new device is the joint invention. of Samuel E. Johnson, station agent at Lombard, and Joseph E. Sauers, of Wheaton. The signal during the daytime is the electric bell which formerly did duty alone. Mr. Johnson, in a description of the device furnished THE TECHNICAL WORLD, says:

"The bell is started by the first wheel of a train. The contacts are set mechanically and are held electrically. The controlling device or starter is connected in series with the bell and five 120-volt incandescent lamps, the lamps being used to cut down the electromotive force


Have you considered the advisability of refunding your floating indebtedness into the more permanent and convenient form of a serial bond issue?

We have for many years made a specialty of issuing serial bonds upon high-class and actively operating manufacturing properties, well established, successfully and ably managed. The serial feature provides for the gradual retirement of the debt in annual or semiannual amounts of such size that the payments are easily met and yet gradually retire the indebtedness. It is becoming more and more the policy of large and successful concerns to Refund Their Floating Indebtedness,

Increase Their Working Capital, or

Extend Their Plants

in this manner, as it relieves them from the endless trouble of discounting notes, and also protects them against the contingencies of the money market. ¶ We handle all the details of such issues and buy them outright. ¶ We have lately loaned $3,650,000 in this manner to some of the best known manufacturers in the country.

We solicit and will give prompt attention to all correspondence on this subjeɛ.


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These three books sent prepaid on receipt of $4.00




Established 1870

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SNAPSHOT OF TRAIN RUNNING 50 MILES AN HOUR. Camera was opened and closed by electric device operated by the train itself.

train were motionless. This is an excellent illustration of what might be called "automatic picture-taking," for the train literally took a snapshot of itself. The camera was set up at the side of the track, fixed at the proper focus, and the shutter of the lens arranged for an instantaneous exposure. In this case the shutter was estimated to have a velocity giving an exposure of only one thousandth of a second. The movement of the shutter was controlled by compressed air, and the valve connected with an electric battery from which a wire was extended to the railroad track. The contrivance was arranged by the photographer in such a way that the instant the front wheel of the locomotive came in contact with the rail at the point where the wire was attached, an electric current would release the shutter valve and make the exposure.

Mention The Technical World.

No. 84


The Renewable parts are made of hard and superior composition; far better than
the usual composition put into Valves, and we do not hesitate to say they will
last many times longer than those in the ordinary Valve.

They are especially suitable for any hard work where extreme pressure is used
and where the wear and tear on the Valve is most severe.

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If you are building a new boat and want to get the greatest speed its lines will allow, or if you have a boat which has not developed the pace you expected, investigate

The Cushman Motor

It never disappoints; it surpasses expectations. The least weight for the power developed makes it the Best Boat Motor on the market.

The New 1905 Model is better than ever. The engine proper is valveless.
The cylinder, water jacket and head are cast in one piece. It is the simplest
as well as the most efficient.

THE CUSHMAN MOTOR holds many speed records. Made in Single and Double,
Cylinder patterns, at prices which make it an economical engine to buy. Handsome
catalogue in press. Write now for booklet and circulars. Agents wanted in leading markets.
We make a full line of Stationary Engines and Automobile Motors.

Cushman Motor Company,

2014 N. St., Lincoln, Neb., U. S. A.

Member National Association Engine and Boat Manufacturers.
See our Exhibit, National Motor Boat Show, Madison Square Garden, N. Y., Feb. 21-March 9.

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Free Instruction by Mail

We have been nearly a year arranging a plan of instruction by which each student can have the benefit of instruction from experienced and competent teachers.

With our personal letters of instruction from our teachers and illustrated course of lessons, finger-board chart and hundred-page book containing simple, clear and concise instructions, beautiful exercises and tunes, we are enabled to teach and interest the student in a way never before possible. Complete Student's Outfit

Full Course Letter Instruction, Root Orchestra Violin, Violin Bow, Violin Case, Extra Set Root Special Strings, Box of Rosin, Tuning Pipe, Finger-Board Chart, Extra Bridge, 100-Page Instruction Book. We furnish the above outfit for your use in learning, and we guarantee that you will learn to play in a manner satisfactory to yourself within three months. For full particulars of our extraordinary offer, write us.

Illustrated Catalog of Violins from 83.75 up, Guitars and Musical Merchandise of all kinds at very low prices, free on request.

E. T. ROOT & SONS, Chicago

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Automatic Fire-Alarm


UNIQUE device at a newly opened hotel in New York, attests the importance which mine host attaches nowadays to automatic appliances for fire protection.

The contrivance consists primarily of a thermostat with an ammonia diaphragm attached. This diaphragm, which is about the size of a five-cent piece, is airtight, filled with ammonia, and fastened inside the thermostat. In the ceiling of each of the 500 or more guest chambers of the hotel, is set one of these firealarms, connected by electric wire with an annunciator in the main office of the hotel. On the disc of the annunciator appear the various room numbers. If a fire breaks out in any room, the ammonia boils directly the heat reaches 130 degrees, expanding the diaphragm, and establishing an electrical contact with the wire leading to the annunciator, thus automatically giving an instant alarm. If, for example, a fire breaks out in room number 290, a glowing red light appears against the corresponding number at the central station.

Nor does the system end here. The annunciator is connected with an alarm gong located in the engine room, where the hotel's fire crew of ten well-drilled men are constantly on duty. Immediately the alarm is given, these men board a special elevator maintained to be used only in case of fire, and are conveyed straightway to the scene of trouble. So perfect is this system of fire protection that it seems hardly possible for a conflagration to gain headway where it is installed.

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Mention The Technical World.

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