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REPORT OF COMMISSION V GV-61 
ing the camera's horizontal field of acceptance. A binocular viewing instrument 
was chosen in preference to the monocular type because it was found that less 
eye fatigue resulted when both eyes received the same amount of light. The 
binoculars accept a larger field than is demarcated by the reticle, which helps 
the operator find the target easily and facilitates tracking to keep the target 
within the lines. 
The binoculars have an acceptance range of about 7.1 degrees, about 1/10th 
that of the vertical acceptance range of the camera. Therefore the binoculars 
are pivoted to provide a vertical binocular movement ranging from 10 degrees 
below the horizon to 40 degrees above. The binocular support is spring loaded 
with the pressure exerted rearward. The operator merely presses his eyes against 
the rubber eyecups to depress the instrument or raises his head to allow it to 
increase its angle of elevation. 
ALIGNMENT COMPONENTS 
The ordinary Analyzer is equipped with an all-way spirit level which permits 
levelling accuracy to within 2 minutes of a degree. This is sufficient for most 
testing operations since the camera is provided with two fiducial markers, one 
on each side of the plate, each projecting a symmetric eight dot pattern. Six 
larger dots form two adjacent squares and aid in finding the small dot centered 
in each square. This method of fiducial marking provides very accurate determi- 
nation of the orientation of the glass plate within the holder, and also in refer- 
ence to the camera itself. A line drawn through the markers passes through the 
axis of the optics of each individual Analyzer, and permits easy correction for 
slight errors in horizontal levelling. The ballistics Analyzers are equipped with 
ground steel levelling pads to accommodate 15-second precision levels for more 
accurate horizontal alignment. 
The alignment of the Analyzer to the flight path is accomplished by the use 
of a calibrated telescope optically aligned with the lens of the Analyzer. By 
sighting this telescope at a pre-surveyed target along the flight path it is possible 
to align the Analyzer to within one minute of a degree perpendicular to the 
flight path. The ballistics Analyzer is equipped with a second bore-sighting 
telescope to provide a right-angle bore-sighting line. This permits accurate 
alignment of two Analyzers set up on the same side of the flight path. 
POWER REQUIREMENTS 
The flight Analyzer is self-powered by six 6-volt dry cells, Burgess 4F-4H or 
equivalent, electrically and dimensionally. The pilot and the timing display 
unit lights and the shutter solenoids operate on 36 volts. The timer drive motor 
operates on 6 volts. 
WHAT THE FLIGHT ANALYZER CAN DO 
The flight Analyzer was conceived, as previously noted, out of fairly specific 
photogrammetric needs. Before the early test models were functioning smoothly, 
however, it became apparent that the envisioned scope of utility was far too 
narrow. Modifications of the Analyzer itself, and the design of auxiliary equip- 
ment became collateral developments as new uses for the instrument were 
evolved by photogrammetrists. Some of the results of these developments are 
mentioned below. 
Higa TRAJECTORY DATA RECORDING 
[t was originally believed that trajectories to be recorded by the Analyzer 
would generally be fairly flat and not exceeding 30 degrees. This limit would en-