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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
NEW ELECTRIC DANGER SIGNAL. Bell and lights as they appear at a grade crossing.
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,
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. G We handle all the details of such issues and buy them outright. G 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 subje&t. PEABODY, HOUGHTELING & CO.
Established 18651214 FIRST NATIONAL BANK BUILDING
Spangenberg's Steam and Electrical Engineering.
A complete Library in one vol.
Spangenberg's 157 Questions and Answers Re
lating to Steam Engineering. 192 Pages
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Price, 75 cents
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 excelMake the
lent illustration of what might be called Perry Time Stamp “automatic picture-taking," for the train your Timekeeper. literally took a snapshot of itself. The Our Time Stamp and camera was set up at the side of the Cost Card System is
track, fixed at the proper focus, and the Economical,
shutter of the lens arranged for an inAccurate and stantaneous exposure.
In this case the Effective.
shutter was estimated to have a velocity Factories employing
giving an exposure of only one thouour system find it simplest and best.
sandth of a second. The movement of Each employee
the shutter was controlled by compressed records his own time air, and the valve connected with an elecon individual cards.
tric battery from which a wire was exNo Chance for
tended to the railroad track. The conErrors.
trivance was arranged by the photo
Write for particulars to grapher in such a way that the instant JUL 13 1904 6
the front wheel of the locomotive came STAMP CO.
in contact with the rail at the point where
the wire was attached, an electric cur11 W. Madison St. RECEIVED Chicago
rent would release the shutter valve and COUNTRY SHIPPING DEPT
make the exposure. Mention The Technical World.
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
Member National Association Engine and Boat Manufacturers.
Mentil i The Technical World.
SCIENCE AND INVENTION-(Continued)
at a newly opened
The contrivance consists primarily of
a thermostat with an ammonia diaphragm Everyone who wishes to keep
attached. thoroughly posted on new and
This diaphragm, which is
about the size of a five-cent piece, is air-
tight, 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 fire-
alarms, connected by electric wire with
an annunciator in the main office of the
On the disc of the annunciator
appear the various room numbers. If a
fire breaks out in any room, the ammonia tricity, Assaying, Medicine and all scientific subjects.
boils directly the heat reaches 130 deA. C. McClurg & Co.
grees, expanding the diaphragm, and es215-221 Wabash Ave. Chicago
tablishing an electrical contact with the
Nor does the system end here. The
annunciator is connected with an alarm It is a sure source of revenue, as well as a most
gong located in the engine room, where desirable
the hotel's fire crew of ten well-drilled accomplishment.
men are constantly on duty. Immediately
the alarm is given, these men board a
an evening is easily obtained with perfect is this system of fire protection
that it seems hardly possible for a conmake their livelihood with the violin, and make splendid incomes.
flagration to gain headway where it is Free Instruction by Mail
installed. 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.
For Tapping Thin
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. Forfull particulars of our extraordinary offer, write us.
OR tapping very thin nuts, sev
FOR Illustrated Catalog of Violins from $3.75 up, Guitars and
eral at a time, the device herewith Musical Merchandise of all kinds at very low prices, free on request.
described has proved very satisfactory, E. T. ROOT @ SONS, Chicago says C. D. King, of Brooklyn, N. Y. The Established, 1857 369 Wabash Avenue
illustration shows a section of the fixture.
It has a socket in which the nuts are
Learn the Violin