A Survey of Elevator Interlocks And An Analysis of Elevator Accident Statistics
A Survey of Elevator Interlocks And An Analysis of Elevator Accident Statistics
Charles E Oakes
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(Young, Experiments and Calculations relating to Physical Optics, Phil. Trans. , 1803. ) Such are some of the more remarkable appearances produced within and beyond the shadows of narrow 729. Bodies. Let us next consider the effect of transmitting a beam through a very narrow aperture. And the first- Ca ? e ^ case is when the aperture is circular. Suppose, for instance, we place a sheet of lead, having a small pin-hole ll pierced through it, in the diverging cone of rays from the image of the s...un, formed by a lens of short focus, and mall ' in the line joining the centres of the hole and focus prolonged place a convex lens or eye-glass, behind which circular the eye is applied. The image of the hole will be seen through the lens as a brilliant spot, encircled by rings aperture, of colours of great vividness, which contract and dilate, and undergo a singular and beautiful alternation of tints, as the distance of the hole from the luminous point on the one hand, or on the eye-glass on the other, is changed.
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