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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 land, 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.

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Prepares for bar in any State. Combines theory and practice. Text books used are same as used in leading resident schools. Teaches law at your home. Three Courses-Regular College Course, Post Graduate and Business Law Courses. Approved by the bench and bar. Full particulars free. Chicago Correspondence School of Law

Reaper Block, Chicago

EVERETT E. KENT

The Verant
COUNSELOR AT LAW
Patents, Foreign and Domestic. Copyrights. IN stereoscopes, as is well known, plas-
Trade Marks in all States.

tic vision is ensured through the comCorporations.

bination of two separate views of the 84 State Street, BOSTON

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.

ELECTRICAL BOOKS

PROGRESS!

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
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All books sent postage prepaid upon receipt of lowest publisher's price Publishers. “ SOUND WAVES” 1562 Monadnock Building

CHICAGO, ILL. 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 d d d Write for Inventor's Hand Book
SHEPHERD & PARKER, Patent Lawyers
“During the past ten years Mr. Shepherd, of Shepberd & Mr. Parker on November 1, 1903, resigned his position as an
Parker, has obtained for us a great many important patents. Peaminer
We have no hesitation in heartüy recommending him to any. Examiner in the U.S. Patent Office to enter this firm.
One baving need of the services of a patent attorney."
HALLWOOD CASH REGISTER CO.

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

DATENTS Advices

SHEPHERD & PS

Mention. The Technical World

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AND DESIGNS.

SCIENCE AND INVENTION-(Continued) 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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Send your business direct to Washington. Saves

time and insures better service. 24 Years Practice. Personal Service Guaranteed. SIGGERS & SIGGERS, Patont Lawyors,

Suite 10, National Union Bldg., Washington, D. C. PATENTS

TRADE MARKS
Obtainod

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R. William Lotz
Suite 45-161 East Randolph Street, CHICAGO

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Rogistered Patent Attornoy Best service, most reasonable rates. All business strictly confidential. Correspondence solicited. Consultation

free. Nomisrepresentations, Free guidebook on request. PATENTS

FREDERICK S. STITT Attorney-at-Law

Registered Patent Attorney 15 WILLIAM ST., NEW YORK Patents obtained in the United States and Foreign Countries. Trade Marks registered. Litigation conducted. Examinations. Opinions.

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PATENTS

SECURED OR FEE RETURNED
FREE opinion as to patentability. Send for Guide
Book and What To Invent, finest publication is-

THE VERANT. sued for free distribution, Patents secured by us advertised A Device for Securing Plastic Vision with a Single Picture free. EVANS, WILKENS & CO. No. 600 F Stroot, N. W. Washington. D. C.

which the objects present themselves to

his eye if the latter be placed at the point LOUIS A.HILL

of the photographic objective and di

rected successively to the different points PATENT ATTORNEY

of the object. This is why an ordinary 1336 New YORK AVENUE

picture fails to convey the impression of WASHINGTON.D.C.

plasticity which we obtain through the

direct inspection of the object the Every me

photographs are taken from. Such plaschanic should

tic effects could be obtained only by hav &

copy of means of a magnified copy of the photoour large 600 page catalogue in his tool kit. The largest graph, which, apart from the additional retail hardware stock in the

world at your command. trouble and cost, would be disturbing in Everything for all trades at wholesale prices. We carry both the medium and the very best the case of the image of a distant object

(landscape or building) having to be Montgomery Ward & Co.

viewed from a relatively small distance. Michigan Ave., Madison and Washington Sts., Chicago

In the verant, a virtual magnification AIR BRUSH The New Art Tool of the photograph is obtained without

We have the best art tool in use for good work. Applies color by

any additional trouble or cost, so as to jet of air. Saves time and drudgery

have the various parts of the image apin cleaning up. Will send descripFOR

tive Circulars Free on request. pear to the eye of an average observer
Any interested in fine shading or
coloring will do well to investigate.

under the same angles of vision as obThe Air Brush Mfg.Co. 134 Nassau St., Rockford, 111., U.S.A. tained when the photograph was taken.

Mention The Technical World.

UNEL

grades. Ask for 600 page Mechanics Cata-
logue. Free to any address.

10

ART WORK

Write at once to

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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”

Mention The Technical World.

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