Gauge

Brass gauge with a glass cover. Numbers are around the outside edge of the face of the gauge from 0-350 in increments of 50. There is a movable arrow in the centre that ends in a crescent shape. A small shield at the bottom of the face of the gauge has the words in it"THE ASHCROFT MFG. CO. NEW YORK REG US PAT OFF 34303". There are three small holes on the lower edge of the gauge's metal body. There is a small threaded pipe coming out the bottom of the gauge.