Constant Compression At All Throttle ,positions.

A Résumé of Recently Published Patent Specifications. A N interesting invention is described in specification No. 276,332, by Marcel A. Violet, of Courbeveie, France. The......

Gas-tight Piston Rings.

A FORM of piston ring is shown in specification No. 2'71,109 (Eugen Mandell, an Italian, resident in Austria), in which three rings are situated in each groove. The main idea so......