Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 355
47 having been exposed for the same time tosolar influence. THE FOCIMETER. Mr. Claudet has also devised a very in-genious instrument for focusing, which hecalls his Focimeter. (Fig. 49.) This it … will be seen from the accompanying wood-cut, consists merely of segments of a cir- cle, numbered and placed at fixed distancesapart, upon a moveable axis. This is co-pied by the camera on a plate or paper,and the result is shown in the annexed fig-ure (50), in which it will be seen different
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