Spaggiari & Barbieri Alfa Benzinmotor

This is very interesting, I am writing an article about this cars. But not the gas powered units, but the electric ones. Does anybody has any information about the wooden surface which was used to supply the current? Was it also made at S&P factory? And about the device installed in the car to get the power? Any photo?

Last question: there was some kind of brake installed in this type of cars? Thank you very much.