Airplane photography by Ives Herbert Eugene 1882-1953

Author:Ives, Herbert Eugene, 1882-1953
Language: eng
Format: epub
Tags: Aerial photography
Publisher: Philadelphia, London, J.B. Lippincott company
Published: 1920-03-25T05:00:00+00:00

Fio. 95. —^Tennifl ball suspension, assisted by elastic bands attached to nose of camera.

nose is restrained by heavy rubber bands. The net result is largely a matter of adjustment.

Tests on the English design made in the United States

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200 AIRPLANE PHOTOGRAPHY

FiQ. 86.—French spring and bcU crank suspenaioa.

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AIRPLANE PHOTOGRAPHY

Fio. 89.— ^TesLs of camera mountiDgs: (a) deRam camera on bell-crank-aDd-apriog mounL below the center of gravity; (6) same, at center of gravity; (c) type **K " film camera on univerwl mounting (Fig. 88).

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Air Service appear to show that the chief virtue of the mounting lies in the approximation of the point of support to the center of gravity in the English cameras. A deRam camera supported by its cone, so that its center of gravity was considerably above the center of support gave rather poor results (Fig. 89a), but when the bell cranks were attached near the center of gravity, highly successful results were obtained (Fig. 896). The French deRam camera as ordered for the American Expeditionary Force was fitted with a bell crank supported in this position.

Figures 90 and 91 show a bell crank mounting furnished with a rotatiQg turret. This was designed to facilitate the changing of magazines in the English BM camera, which is swimg around through 90 degrees from the exposing position to bring the ^magazine near the observer. The camera shown in the moimting is the American hand-operated model (type M), in. which there is the same necessity for turning in order to manipulate the bag magazine easily. The camera is shown in both exposing and plate changing positions. An important detail of these mounts is a safety catchy which must be fastened before the plane lands, in order to prevent the shocks of landing from producing oscillations sufficient to throw the camera out of the mount.

Center of Gravity Rubber Pad Supports.—Given a camera whose center of gravity does not change during operation, a simple and entirely adequate anti-vibration support is furnished by a ring of sponge rubber in the plane of the center of gravity. But if provision has to be made for oblique views or for adjusting the camera to the vertical, something more elaborate is necessary.

Mountings for the American deRam and for the Air Service film camera, embodying the results of complete study of the anti-vibration problem, are shown in Figs. 90,

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204 AIRPLANE PHOTOGRAPHY

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92 and 93. Trusses carrying the cameras on pivots rest on four pads of sponge rubber which are mounted on frames

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Fio. 94.—U. S. type **K" film camera on universal mounting, vertical position.

J Fio. OS*—U. S. type **K" film camera on universal mounting, oblique position.

correctly spaced ready for attachment to the cross-pieces of the airplane camera supports. In the deRam (Fig. 90) the pivots, attached to the camera body, permit it to be

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206 AIRPLANE PHOTOGRAPHY

leveled fore and aft, to compensate for the inclined position of the fuselage assumed at high altitudes or in some condi-

Fio. 94.—TesU on two types of camera mount: (a) Support at bottom of camera; (h) support

above center of gravity.

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