pistons: The pistons used in the 1929 engine had one compression ring and one oil scraper ring above the piston pin, and one oil scraper ring below it.
"The First Airplane Diesel Engine: Packard Model DR-980 of 1928"
Robert B. Meyer
The air was darkened with bursting clouds of blackest smoke, in the midst of which beams, guns, pistons, boilers, armour-plates, human limbs and heads were seen hurling about like the debris of a wrecked universe.
"In the Track of the Troops"
R.M. Ballantyne
From a running gait the stallion fell into a smooth pace-a true wild pacer, his hoofs beating the ground with the force and speed of pistons and hurling himself forward with incredible strides.
"Black Jack"
Max Brand