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News Letter 1940 Jul-Dec - Air Force Historical Studies Office

News Letter 1940 Jul-Dec - Air Force Historical Studies Office

News Letter 1940 Jul-Dec - Air Force Historical Studies Office

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:Bythe use of a filter between the plane mirrors, an iris diaplu'agm.:ho:l!\!!3:r;<br />

lamp placed at the end of the colli- , for the'shutter, and an enclosed rot at"!;<br />

mator and the targEjlt in the collimator, ing discwh~ch'holds film or.1?n~!!1i.df:r.5<br />

it is possible to determine the results paper on much is recorded, 'ln ,a,;series<br />

riven by the lens for. the different ' of high-speed motion picture silhOuet{es,<br />

filters used in aerial photogl.'a.phy. For the record of the openfng andc;Lbs~ngoj<br />

exampl.e, if a minus blue filter is used of tht;l shutter, Know1ngthe .s:pEle

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