Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 361
ve includes an angle of 165°; whereas if it was possible for a lens offifteen inches focus to cover a flat surface of forty-eight inches, the anglewould only be 110°. The photographs here for |your examination fully illustrate how per-fectly the celluloid answers the purpose to hold the sensitive… … yyy*^mm^^ss^m?^^f^^»9m^mm^kf»!$ss9a»gs^4^A, ^c^. ^V r IZ,, ^ I / > .V<- [Carbutt,)
Science · Technology · Meteorology · Patents
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
