208 



RECORDING. 



FIG. 38. F 96 a sec. timing fork 

 S 10 a sec. spring, B; B their driving 

 batteries, TK keys carried by F and S 

 bridging the table circuits (mercury 

 cups) and dry contact in the clock. 

 TB main table circuit battery joined in 

 parallel as required, SG electric style, 

 TP plugs numbered to correspond 

 with the tables and by means of 

 which the style is placed in circuit 

 with TK of either clock, F or S. 



FIG. 37. Time distribution board as set up in 

 the laboratory. 



