192 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1948 
ELAPSED FLIGHT TIME 
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FicurE 2.—Typical section of telemetering record. Top and bottom of the record are timing 
signals. The subcommutated channels at the top of the record represent different types of 
pressure and temperature information, each individual deflection corresponding to a differ- 
ent gauge. The ionosphere channels at this time in the record present essentially direct 
current information. The roll gyroscope shows no roll since the missile is still in its stabilized 
period. The rest of the record is self explanatory. 
Naval Research Laboratory (11). 
The information is transmitted by 
means of a group of pulses such that 
the intelligence on any given channel 
is contained in the spacing between 
two adjacent pulses. Twenty-four 
such pulses constitute one group for a 
23-channel system. ‘The group re- 
peats at a rate of approximately 200 
cycles per second; hence each channel 
is sampled at this rate. Plate 1, 
figure 2 shows the complete telemeter- 
ing unit in its pressurized container. 
Pressurization is, of course, necessary 
to avoid arc-over and corona at the 
lower pressures which the missle 
