Pilots' Airplane Manual CAA Bulletin 27 1940 DC-7 Here is an engine Torque

Here is an engine Torque Pressure Indicator

Model 1122

transport C-130 Hercules

Here is Radar Pressure Indicator use in radar-equipped aircraft during late WWII and post WWII

it measures change in barometric pressure that is interpreted as altitude and recorded on a rotating chart drum

Pilots' Airplane Manual CAA Bulletin 27 1940 DC-7 Here is an engine TorqueThis is an original general aviation Pilots' Airplane Manual published by the Civil Aeronautics Administration in September 1940 as Bulletin No. 27. The focus on this manual is the structure, maintenance, and rigging of aircraft. This 150 page, 8. 5 x 11 inch manual is in reasonable condition given its age. There are a few minor tears, but the pages appear to be intact.