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Air Force the Official Service Journal - Air Force Historical Studies ...

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;;;::::::;:~:::;:::::::::::::::::::::::::::::::::::::::::::::::;:::::::;::; :<br />

sharpness. But in tree-top Icvcl aerial<br />

photography, <strong>the</strong> sh u t tcrs of ,ingleexpos\Hc<br />

c.nncr.rx arc not fa,t cnollgh to<br />

stop <strong>the</strong> motion of tIle grolllld as it<br />

st rcakx past <strong>the</strong> lens,<br />

Ra<strong>the</strong>r th.m attempt to prodllce a<br />

,hntter that would ,top IIlotiolla mechn<br />

nical inlpm,ihilitl, since in hllge<br />

,Ierial CllIlcr:1\ thc shut tcr nui-! opcn<br />

and close mer .t n ,Ipc'rtmc fill' or six<br />

inches in di,lInder-- <strong>the</strong> enginecrs of<br />

\\'right licld» I'hotogLlphie lnbor.itorv,<br />

l':ngincering Diviviou, plnnged into <strong>the</strong><br />

clcvclopmcn t of ,I ,1JlIttcrlcss c.nncr.i in<br />

which <strong>the</strong> film woulcl 1I1o\'e :ICTOSS <strong>the</strong><br />

lens at <strong>the</strong> ,alllC Cite ,IS <strong>the</strong> im.rgc of<br />

objects on <strong>the</strong> grollnd moved past.<br />

The t.isk lIas to couvert <strong>the</strong> spas-<br />

modic film motion of <strong>the</strong> orcl iuarv<br />

,ingle-expm\He c.uucra to a -tcaclv, even<br />

flo\l',s~'lIchrolli/ed Ilith thc spceci of <strong>the</strong><br />

~ronnd helml, .vnd after mTreOlning<br />

e'lo:l

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