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JONES AND EYLES
November
the rail, thus mechanically amplified, were plotted against time as recorded by the camera time base. This method has now been used successfully for a large number of applications to industrial problems. A more elaborate optical-mechanical arrangement has been described by Eyles9 and was used in the course of the examination of the movement of the anvil of a large drop-forging hammer. The hammer itself weighed 8 tons and, after operation for some time, it was found
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Fig. 6 — Optical-mechanical arrangement for examination of movement of anvil in large drop-forging hammer.
a. Convex lens attached to a reflecting prism fastened to anvil to give a uniformly bright disk of light that can be photographed.
b. Method of damping shutter blade with a dashpot so that top edge of blade is just below bottom edge of mask on illuminated disk.
c. Enlarged section of b.
d. Curve showing amplitude and duration of the vibration of the anvil.
that the foundations of the anvil showed signs of deterioration. The noise, flame, and smoke produced when the hammer was dropped were such that visual observation of the movement of the anvil was difficult, and various observers estimated it at between one hundredth of an inch and a quarter of an inch at each blow. Direct photography of the anvil was out of the question, owing to the small degree of movement and the shock transmitted through the surrounding ground. It was therefore decided to photograph a point on the anvil in relation