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Economical Power

In sending out their last specifications for gasoline engines for West Point, the U. S. War Department required them "to be OLDS ENGINES or equal." They excel all others, or the U. S. Government would not demand them.

They are the horizontal type, 2 to 100 H. P., and are so simply and perfectly made that it requires no experience to run them, and

Repairs Practically Cost Nothing

Send for a catalogue of our Wizard Engine, 2 to 8
H. P., (spark ignition system, the same as in the
famous Oldsmobile), the most economical small
power engine made; fitted with either jack-
pump or direct-connected pump. Or, our
general catalogue, showing all sizes.
Lansing, Mich.



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Civil, Mechanical, Electrical and Chemical Engineering

New Laboratories and Excellent Equipment. Beautiful site within four miles of Boston. Preparatory Department for students who have had engineering practice, but insufficient preparation for college work.

For information concerning courses and positions of graduntes, address

H. G. CHASE, Secretary,

Tufts College P. O., Mass.

The University of Rochester

A College of Liberal Arts

Scientific Course for Technical

Six years required for combined College and
Engineering degrees in co-operation with The
Massachusetts Institute of Technology and
Sibley College at Cornell. New laboratories,
thoroughly modern equipment. Special circu-
lar and catalogue sent on application. Address

F. L. LAMSON, Registrar
Rochester, N. Y.





Troy, N.Y.

Local examinations provided for. Send for a Catalogue


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screwed the hand nut C. The pin c prevents the sleeve. B from turning in the holder A. Inside B is the inner sleeve D, with the recess d to receive the nut blanks E. A key F prevents D from turning. At its rear end is fitted a disc G, upon which bears the set screw I. whereby the nuts are clamped in.

The method of operation is to place the nuts in the recess d, and screw up the nut C by hand, which is very quickly done. Then a small part of a turn of the set screw I with a wrench, clamps all firmly for the tapping, upon the completion of which the operations are reversed.




Patents, Foreign and Domestic. Copyrights. Trade Marks in all States.


84 State Street, BOSTON

The Verant

IN stereoscopes, as is well known, plastic vision is ensured through the combination of two separate views of the same object, corresponding to the images formed by the original in each eye respectively. The superposition of these two images produces an impression much

Mention The Technical World.



Is the Watchword in the Electrical Profession and you must keep

in touch with the Masters in the Field or you will Rust Out.

We can furnish you all of the Latest and Best Books including works
covering the entire technical field. Write for our New Catalogue.

All books sent postage prepaid upon receipt of lowest publisher's price

Publishers, "SOUND WAVES" 1362 Monadnock Building


If interested in Telephony, ask for sample copy of Sound Waves," The Telephone Journal, when you write for Catalogue

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Valuable and Salable Patents Promptly Secured.
Advice as to Patentability and Commercial Value
Free Write for Inventor's Hand Book

SHEPHERD & PARKER, Patent Lawyers

"During the past ten years Mr. Shepherd, of Shepherd & Parker, has obtained for us a great many important patents. We have no hesitation in heartily recommending him to anyone having need of the services of a patent attorney." HALLWOOD CASH REGISTER CO.

Mr. Parker on November 1, 1903, resigned his position as an Examiner in the U. S. Patent Office to enter this firm.

Address, 844 G. St., Washington, D. C.

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more true to nature than that secured by a single picture.

That similar effects are possible in the case of "monocular" vision, the picture being inspected with one eye only, is demonstrated by a novel instrument-the "Verant" - just brought out by a firm in Jena, Germany.

When viewing, with one eye, photographs taken with objectives of a focal distance noticeably inferior to the socalled distance of distinct vision, viz., 26 centimeters (10.2 + inches), an observer of normal visual power is incapable of obtaining the same angle of vision under

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which the objects present themselves to his eye if the latter be placed at the point of the photographic objective and directed successively to the different points. of the object. This is why an ordinary picture fails to convey the impression of plasticity which we obtain through the direct inspection of the object the photographs are taken from. Such plastic effects could be obtained only by means of a magnified copy of the photograph, which, apart from the additional trouble and cost, would be disturbing in the case of the image of a distant object (landscape or building) having to be viewed from a relatively small distance.

In the verant, a virtual magnification of the photograph is obtained without any additional trouble or cost, so as to have the various parts of the image appear to the eye of an average observer under the same angles of vision as obtained when the photograph was taken.

Mention The Technical World.

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If you are not interested, refer to some live, energetic young man-a hustler-and accept in return, the thanks of "THE TECHNICAL WORLD"

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