and a length of 4 feet 5 inches. Each leg has 

 an attached aluminum block that supports the 

 cross members. One end of each of the legs 

 is flattened to fit between two, right-angled 

 bars of aluminum on each corner of the base 

 (figs. 10 and 11). 



Figure 10.--A3Ben4>led device readj- for opeivtioE 



Figure ll.--E«plodetJ viev of pbOlOdrapClc Beaiurlng device. {IJ Rubber 

 •tope tb*t keep croea aenber ^1 Tirmly •eaCed tn ti.e elota 

 fan anown In Fl^^urea 12 end 13)i (2) aolenolda; (3) caaeraa; 

 (li) ^ap an] nlna that hold leF:a flraly aeated In tba recepteclea 

 of the cap: (5) croaa Benber fl; (6) edjtiataent waabera tbet 

 afforda adjustment of tbe endvlae rotation of the caaeraai 

 (7) butler end buzter battery; (8) etrobe Ught; (9) refleetor; 

 (10) crose neaber gs vltb adjuatnent bolt that afforda adjuat. 

 ■ant of the eldevaye rotation of tbe eeaerea; (11) bettery boa; 

 (12) avltcb; (13) flaab supply; (lit) 6-volt batteries; (15) 

 aiglial-reglater; (16) lege; (17) bolte used to ettacb lege to 

 baee, (18) Use. 



Cap. --The cap is composed of four short 

 lengths of aluminum tubing having an inside 

 diameter equal to the outside diameter of the 

 legs. These short lengths are welded together 

 at appropriate angles and serve as sockets for 

 the four legs . Short pins are used to keep the 

 legs seated firmly in these sockets. 



Cross members #1 and #2 . --Cross 



members #1 and #2 are round aluminum tubes 

 of the same diameter as the legs. Figures 12 

 and 13 shows how cross member #1 is attached 

 to the legs. Cross member #1 is 23 inches long 

 and #2 is 8 inches long. Both members together 

 act as stiffeners for the legs and provide a means 

 of attaching the strobe light between the two 

 cameras . 



The cameras are supported by cross 

 member #1, and the cameras can be aimed at 

 any point on the grid by rotating them sideways 

 and endwise, as shown in figures 14 and 15. 

 Square bars on either end of this cross member 

 provide flat surfaces against which the cameras 

 are held by single bolts . Thus, each camera 

 can be rotated endwise with the bolt acting as the 

 axis of rotation. An "adjustment washer" affords 

 a means of fixing the cameras at any position in 

 the endwise rotation. The flat bar attached at 

 right angles to cross member #1 and extending 

 across to cross member #2 can be raised or 

 lowered by an adjustment screw at cross member 

 #2, thus rotating the cameras sideways (fig. 15). 



1 nember fl being attached to 



