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CINEMA TOGRA PHIC ANNI'Al,
Fig. 2 7 The Bell ft Howell Automatic Portable 35 mm.. Eyemo Camera. This camera is of the spring motor type, and holds 100 feet of 35 mm. film. It is Daylight loading, and operates 5 0 feet at each complete winding of the spring. Three models are made: one, which can be operated at either eight or sixteen frames per second; one for use at either twelve, sixteen or twenty-four frames per second; and the third for moderate high-speed use, at 64 pictures per second.
scorn by the uninitiated have, however, been extremely prolific in the technical advances which made possible the more presumptious motion picture productions of today.
Tachometers were made part of the camera, eliminating the drudgery of the necessity of paying constant and minute attention to the mechanical details of operation of the instrument and permitting the Cinematographer to devote his energy almost entirely to the expressing of his artistic endeavors.
Vignetting devices of all sorts, independent from the camera, or made intrinsic parts of the instrument, were designed and became, in the hands of the Cinematographer, a potential means of expression.
Photographic objectives were improved in design and their apertures gradually increased to the truly remarkable speed lenses of today, and their mountings were devised with such extreme attention to design and construction that they permit the setting of the lenses within almost immeasurably close tolerances.
The necessity of portability spurred inventors to device automatic portable cameras with spring or electric motor drive such as the Bell & Howell Eyemo, the DeVry, the Cinex and the Sinclair Auto-Kine which are as accurate in design, workmanship and operation as standard cameras.
The necessity of absolute and perfect registration in cameras, as well as in laboratory and projection apparatus presented such diversified and complex problems that they attracted the attention of some of the best recognized mechanical engineers, who, with the conservatism proper to engineering developments and the enthusiasm spurred by new ideals, created cameras so perfect in design that they took their rightful place among instruments of high precision.
The fear of the high cost of the product, which has sounded the death knell of many promising enterprises, was courageously dis