3) the motor starting capacitor (c,) 
discharges. 
When the timing motor cam returns S 
to position NO current is again fed to the cee 
cator data lamp and motor starting capacitors. 
As capacitor Cz starts to charge up again, tran- 
sistor Q3 conducts, and current flows into the 
base of Q,- Operating current is supplied to the 
film driven motor M, when transistor Q, starts 
conducting. This current is transitory (lasting 
about 1 sec) and lasts until the voltage C, rises 
to 6 volts. The film drive motor simultaneously 
drives cam switch Sy, during this period into 
position NO which connects the film drive motor 
directly to the 6 volt current line. The film 
motor advances the film one frame. When cam Sy 
moves back into position NC, power is removed 
from the motor. The film stops advancing, and 
the operating cycle is complete. Resistor Rq1 
limits overtravel when current is removed from 
the motor by a dynamic braking action on the 
motor. 
B. Adaptability 
A terminal board at one end of the data 
camera facilitates wiring changes of the selector 
90 
switch. The instrument outputs and selector 
switch leads are terminated at this board. The 
sensor instrument inputs are wired up patch panel 
fashion. The terminal board also allows place- 
ment of any meter shunts necessary to make each 
sensing instrument compatible with the read out 
meter. 
Iv APPLICATIONS 
The data camera can be used for a wide 
variety of oceanographic data collecting appli- 
cations. It is very useful for lapse time data 
recording over extended periods of time up to 
several months. The data camera with associated 
sensing elements can be lowered to the sea floor 
and left for extended periods. For example, such 
things as temperature probes tor heat flow 
measurements can be recorded from a number of 
thermistors and bottom water temperatures can 
also be measured along with variables such as the 
current velocity and direction from current 
meters, salinity variation, and acoustical 
variables. Continuous hourly and daily variations 
of oceanic factors can be clearly and concisely 
recorded in this manner and analyzed when the 
entire unit is recovered and the film processed. 
