Dear Friends in steam,

my Little Locomobile war enhanced in 1905 with a Overman steam pump. I restored all parts of the pump when necessary but anyhow it doesn´t work against pressure.
If the pump works free it runs very well but when trying to pum against the pressure in the boiler it stopps after some strokes in a position where steam can bypass the cylinder directly to the exhaust.
The function of this pump is very good explained in the US patent of Mr. Bullard.

Best wishes from Vienna,
Peter