Motometers
by John & Henri Boggs.

Boyce - On Elison Winged Cap.

A 1920's Boyce Universal motometer, fitted to an Elison winged radiator cap.  The cap is nickel plated and was produced by the Elison Bronze Company of Jamestown, NY.

The wings swing back from their locked position, which allows the cap to flip up.  The engine coolant can then be added to the radiator.