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SCIENCE AND INVENTION-(Continued) placed and clamped rather freely by a

coarsely threaded hand nut, and finally DEPARTMENT OF

pinched tightly by a set screw, the tapENGINEERING

ping being done in a lathe or tapping

machine as desired. Civil, Mecbanical, Electrical

A is a cast-iron holder with a pipe and Chemical Engineering

handle; and fitted into it is the steel New Laboratories and Excellent Equipment. Beautiful site within four miles of Boston. Preparatory Department for

sleeve B, which has at one end two turns students who have had engineering practice, but insufficient of a very coarse thread whereon is preparation for college work.

For information concerning courses and positions of graduates, 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.


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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.



The Verant
Patents, Foreign and Domestic. Copyrights.

IN stereoscopes, as is well known, plas-
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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 llantion The Technical World.



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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.

No. 600 F Stroot, N. W. Washington, D. C.

which the objects present themselves to

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

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

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tained when the photograph was taken. Mention The Technical World.




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