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A clockwork break is used to slow down its movement (which can be further retarded by the addition of a fan air brake), so that ... For Developing Roller Films the aquot;Volvoaquot; apparatus of Geo. ... taken at full aperture (F. 6a#39;8) ; and in order to show the results more clearly, the diagram is magnified in the vertical direction. The horizontal clotted lines thus represent a distance of one millimetre of an inch) , in the curvature of the field, whence it ... At F. 45 the angle subtended by the flat field is 84a#39;.

Author:Henry Snowden Ward
Publisher: - 1900


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