WIRELESS TIME SIGNALS. 



275 



with the greatest ease and certainty, but the slightest want 

 of beat (irregularity of seconds) can be immediately and 

 obtrusively detected. 



(4) Alternatively, the radio signals can be made to lose, 

 instead of gain, about one second in one hundred, and this 

 appears to us to be rather better. In this case coincidence 

 occurs at the first perceptible tick after the silence, instead 

 of the last heard. It seemed to us to be easier to describe 

 the gaining arrangement, but our own personal feeling is 

 in favour of the losing ticks. 



(5) It is an essential point that the duration of the clos- 

 ing of c should be slightly longer than the length of the r 

 ticks : and to ensure the practicability of always obtaining 

 this adjustment it is advisable to have some form of slow- 

 acting relay. There are several on the market, but amongst 

 those which we have seen, nothing appears to be quite 

 suitable, so the following form was adopted. 



— TRONT VCW 



SIDE VIEW 



In the above, E M are the electro magnets; A the arma- 

 ture, pivoted at p p; R a light rod passing through the 

 armature and carrying a weight W; c the contact between 

 the armature and a light spring. 



Normally the clock circuit is closed, and broken momen- 

 tarily every secoad. Therefore as a rule the armature 



