Then came the "twin-tractor plus propeller" (at top).
"The Aeroplane Speaks" by H. Barber
The latter, to distinguish them, are called "Tractor" machines, since in their case the propeller pulls them along.
"The Romance of War Inventions" by Thomas W. Corbin
Four 100 h. p. German "Argus" engines, driving four tractor propellers sent it racing triumphantly through the air.
"The Romance of Aircraft" by Lawrence Yard Smith