153 
Fig. 49. Chronograph circuits ;. A, contacts ; B, condensers (4 microfrrads each) ; C, resistances (106 ohins 
each); D, transformers; E, spark chronograph; F, tuning-fork; G,H, wound magnets ; 
J, microphone ; J, telephone. 
E (Foor- Pours) 
re UCSC eC 
4 s ‘7 68 Ss e& 2B 2 eo 8H s&s @&@ Ff B& 8 tO wb 8 
0 (Tacusanntas of An cn) 
Fig. 50. Two sections of the copper calibration curve, showing the actual calibration results with pistons 
of different weights, (I) 224 ounces (2) 44 ovnces, (3) 3 ounces, (4) 14 ounces. 
