1
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seconds prior to launch the umbilical

2
00:00:17,670 --> 00:00:14,800
cord disengaged and at 7:20 a.m. on July

3
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21 the free world's second manned

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suborbital mercury flight was airborne

5
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inside the mercury Control Center

6
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astronaut Shepard verified Grissom's

7
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condition and systems reports and

8
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advised the test pilot of pitch and

9
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trajectory disposition the fuel system

10
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was gold Griffin was experiencing 1 and

11
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1/2 G cabin pressure was 8 pounds per

12
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square inch and the oxygen system was go

13
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all systems were go the flight surgeon

14
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maintained close observation of the test

15
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pilots physiological status as the

16
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flight progressed

17
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Grissom's electrocardiogram showed no

18
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abnormalities his heartbeat respiration

19
00:01:01,739 --> 00:00:58,300
and body temperatures were within the

20
00:01:03,779 --> 00:01:01,749
expected tolerances at engine cutoff the

21
00:01:06,750 --> 00:01:03,789
spacecraft made its turnaround and the

22
00:01:08,460 --> 00:01:06,760
astronaut was now weightless the

23
00:01:10,290 --> 00:01:08,470
environmental system was monitored in

24
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the control center as the astronaut

25
00:01:15,720 --> 00:01:12,510
reported his cabin pressure holding at

26
00:01:17,490 --> 00:01:15,730
5.5 pounds per square inch suit pressure

27
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was good the flights progress was

28
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charted on the plot boards the

29
00:01:22,860 --> 00:01:20,830
spacecraft position as well as the