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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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The Verant
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.



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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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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

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

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

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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.

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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


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