MEASURING SMALL TIME INTERVALS 



347 



connections. The oscillator is connected directly to the input of the 

 detector and the terminals a and b of the bridge are connected across 

 the oscillator output. Contact m of relay Z is connected to terminal d, 

 and terminal c is grounded. The closing of key K will then cause a 

 short circuit to be placed across the output of the oscillator, thereby 

 initiating the releasing of relay Z. As soon as the latter occurs, a short 

 circuit is removed from the winding of relay X, allowing this relay to 



Fig. 3 



operate and open the charging circuit of the condenser Ci. Except for 

 the differences noted, the operation of the bridge is the same as 

 described above. 



Other conditions of measurement, for example, a measurement of 

 the time required for the armature of relay Z to reach its 5 contact 

 after a short circuit is applied to the output of the oscillator will be 

 obvious from the two examples given. It should also be obvious that 

 a battery and suitable resistances may be substituted for the oscillator 

 and detector and measurements made in this direct-current circuit in 

 the same manner as above. 



