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Society of Motion Picture Engineers : incorporation and by-laws (1927)

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Polygonal Floodlight Mirror — Benford and Palmer 119 at the siege of Syracuse is supposed to have been set on fire by sunhght reflected from a mirror built by Archimedes. Regardless of the accuracy of this account, the sectional mirror has been used on BEAM CH/\HACTEFf/5T/C^ ■ E5 SECTION 3G'DI A. POLYGONAL MIF^ROR FOCAL LENQTH IE. 65" I50AMPHIQH INTENSITY ARC BEAM FROM UNOBSTRUCTED MIRROR A BEAM OBSTRUCTED BY SEARCH L I'GHT BARREL B COMPUTED C TEST — (O 3.000 ^2500 % zpoo ^ 1500 5 1 1000 CD S 500 1 o c 1 1 1 1 1 1 1 1 1 1 1 ' M 1 1 1 1 BEAM IrJiDTH LUMENS A BP 522.000 — — B Z9° ES4,O0O — — i C 50° E 54.0 00 1 "> "^ ^. ^_ N k^' \ '^ -. r ^, \ ^ V ^ _^ n^ k \ b x \ \ \ ^ \ ^ \ s \ \ s \ \ ^ \ \ ^ y 1 V \^ VN \, N N> A \ ^ ') 5 /O 15 ^0 ai DEQREES PROM AXIS OF BEAM 5 Fig. 8 — A study of the effects of barrel interference with the beam from a polygonal mirror: A — Unobstructed beam; B — Obstructed beam (computed); C — Obstructed beam (test). various occasions, particularly in theatrical work, and therefore the basic conception of a sectional or polygonal mirror is not a matter of current history. The new feature of the present mirror is the manner in which the individual mirrors are formed so as to give a multiplicity of beams, each agreeing as far as possible with all the other beams both in direction and in size.