REPORT OF COMMISSION V GV—65 
the Analyzer record may then be rectified for that angle by usual photogram- 
metric methods. 
One last point on this third method should be mentioned. Mid-shutter 
position on the Flight Analyzer occurs between 3 and 10 milliseconds from the 
front of the pulse wave beamed out. The time delay through the radio linkage 
(chiefly in the relays) is 10 milliseconds. Therefore the command signal for the 
pulse camera is very close to being in synchronization with the Analyzer. Any 
pulse actuated camera will require some small time period for response, and 
thus lag the Analyzer by that amount. Except in violent maneuvers, however, 
this would be so slight as to be ignored in most cases. 
SLAVE-MASTER ANALYZER SET-UP 
For some data-recording work it is advantageous to slave a second analyzer 
to the first in such a way that the shutter of the second is fired not by its lateral 
tracking motion, but by pulses from the shutter of the master Analyzer. This 
results in absolutely synchronous photographs of the space position of the 
target, and greatly simplifies the data-reduction problem. Even if the slave 
instrument is not tracked exactly with the master, it will record exactly the 
same number of images. The pictorial value of the plate might deteriorate some- 
what if the slave Analyzer is tracked slightly differently than the master, but 
the pictorial quality has no effect on a record's statistical or data value. 
RADIO INTERLINKAGE SYSTEM 
The Radio Interlinkage system consists of dry-cell powered crystal-con- 
trolled 5 watt transmitters (Figure 10), and crystal-controlled dual-channel 
  
Fic. 10. Pulse linking radio transmitter 
receivers (Figure 11), also dry-cell powered. Two channels have been assigned 
to the system by the Federal Communications Commission 217.550 and 219.450 
megacycles. The square wave pulse, generated at the Analyzer each time the 
shutter is tripped, is transmitted over this system to trigger the operation of 
auxiliary cameras or other types of recording equipment. This makes it possible 
to record such factors as aircraft instrument calibration, instrument time lag, 
configuration, flap settings and propeller position, for point-by-point correla- 
tion with the physical performance as established by the Analyzer record. 
When fields of recording overlap, there are intervals when two pulses will 
be transmitted to the auxiliary cameras. This danger is eliminated by using