Pneumatic timer, T. Mayhew & Company.
|Maker||T. Mayhew and Company|
|Place of Origin||New York, New York, USA|
|Notes||This pneumatic timer has an 8-hour balance/lever movement, designed to measure the total time of a non-vacuum condition, by virtue of a leather bellows that pulls a piece of spring steel into the balance whenever it receives vacuum. (www.antiqueclockspriceguide.com/pages/clock0887)|