Pocket Tyre Gauge.
APOCKET gauge for readingtyre pressures, fitting like a fountain pen into the waistcoat pocket, is now being marketed by the Dunlop Rubber Co. Ltd.. There are two models—the balloon, reading from 6 to 52 lbs. per square inch in 1 lb. units, and the giant from 30 to 170 lbs. in 5 lbs. units. The plunger is calibrated to show these increases and the little instrument is both simple to work and remarkably accurate in its recording.