Triple programmer, possibly used for harbour lights, ca. 1920


 Impulse contact makers, or Programmers could be included in the Pulsynetic System, operated by the Time transmitter in the usual manner.
Bells, hooters or sirens distributed throughout a building are thus automatically operated to a pre-arranged programme. 


Fig. C69 Adjustable programmer.
By using pins, set into the big wheel, contacts could be made with a minimal interval of 5 minutes.

Fig. C102 Non-adjustable Contact Maker.
In the non adjustable contactmakers one or more notches were cut into a disc at The Works. The programme of times was therefore to be stated when ordering. c 1940.