Voltage ———> 
21 
Figure 10b Figure 10c 
591 
Time —e 
Figure 10a 
Figure 10 - Voltage Signals Produced by Three Cables Subjected to 
the Underwater Explosion of a Detonator 
Figure 10a shows a signal from a rubber-sheathed cable; Figure 10b, a signal from a coaxial 
copper-tube cable; and Figure 10c, a signal from a wax-filled TMB cable. 
Figures 10b and 10c were originally taken at larger amplifications than those exhibited here, 
to permit accurate measurement. They have been reduced to show the three cable signals 
approximately to the same voltage scale. The apparently sharper focus in Figures 10b and 
10c is due to this reduction. The time scales are different. The total time on each oscil- 
logram is the same, 12 milliseconds. 
TABLE 2 
Comparison of Peak Voltages of TMB Wax-Filled Cable 
and Unmodified Cable 
Peak Voltage, millivolts 
Sidewise Endwise 
Gable Orientation Orientation 
Figure 9a Figure 9b 
E 12.9 2.0 
TMB Bau! 2.6 
which gives the peak voltages obtained with the original and the modified 
cables for the positions shown in Figure 9. 
was 50 micromicrofarads per foot. 
Figure 10 is a comparison of voltage-signal records from a rubb 
cable, from the unmodified copper-tube cable, and from the TMB cable. It 
The capacitance of the TMB cable 
er 
