Flame propogation in gas engines photographed. Washington, D.C., Aug. 26. A study of the mechanism of the flame propogation in the cylinder of a internal combustion engine is being made at the U.S. Bureau of Standards for the National Advisory Committee for Aeronautics. A secial bomb made of steel, shown in the foreground, and designed to withstand pressures up to 500 lbs. to the square inch is used to show the progress of the flame and the rise in pressure which may be recorded photographically during the gas explosions under carefully controlled conditions. The camera, where the recordings are made, is in front of Dr. Ernest F. Flock of the Bureau of Standards, carries its film on a drum which may be revolved up to 4,000 revolutions per minute, this camera also records a neon light flashing at a thousandth of a second. The independent effects of pressure, temperature and charge composition upon flame speed and explosion ratio may be made with this equipment, 8/26/37