The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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. Angle
One of the most usual methods, and perhaps the most convenient
method of all, is by means ot the following plan. Draw a straight line a B equal in length to the longer base of the plate used, bisect
Fig. 2.
this accurately at c, from c draw a perpendicular d c equal to the focal length of the lens, connect a d, d b, then the angle included
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