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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
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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.
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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
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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
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.
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