Notes on the synchronous commutator

In the use of the synchronous commutator in series connection as a suppressor, serious errors may arise due to relatively small amounts of capacity in the commutator and galvanometer circuits. The magnitude of these errors is studied for a number of different connections, and methods for eliminating them are pointed out. A number of wave forms are given, indicating the nature of the errors. Used as a shunt suppressor the commutator is far more reliable and this method of connection is always to be preferred. An appendix gives a theoretical analysis of two cases investigated and shows a close agreement with the experimental observations.