Gauge

a- A circular metal gauge with a glass front that is on hinges and can be opened with a key on the side. Inside the gauge is a six digit counter. On the surface of the gauge is the manufacturers information, "OSBORNE-KILLEY MFG. CO. HAMILTON ONT. REVOLUTION COUNTER J.MORRISON MAKER TORONTO". There is a small pipe coming from the side of the metal body. The other side has a key hole. There are three small holes on the bottom edge of the metal body. b- A small metal key that opens the face of the gauge.