I was just about to post the above link to Vince Falter's page regarding these engines used on grain Combines. For anyone wondering, Binders were pre-combine machines pulled by either a team of horses or a small tractor and used to cut and tie the grain into bunches which were then pitched into a threshing machine to separate the grain from the straw. The Combine combined these two operations making for a much less labour intensive operation.
yes and no.binder was what was pulled by horses or a tractor, and yes cut the wheat and " bound" it into bundles ,which were put into stooks later. Stooks are 3-4-5 bundles gathered up by hand and stood up grain end up to help the grain dry and or stay dry.this machine was replace with a modern day swather. same job cuts and lays the crop in a swath rather than putting it in bundles and then stooks.
early thresh machines had no motor to run it, so no powered wheels, so needed to be pulled field to field with horses or tractor. so you have a thrash machine and a traction engine to move it and to drive the thrasher with a belt. the next step was to put an engine on the trasher to drive it run it but not self propelled. so you still needed the tractor to pull it around the next step was to COMBINE the tractor and thrasher so it became a self propelled thrasher, or as has come to be commonly know as a combine.
so we do it basically the same way, swath the grain, and leave it lay in swaths until it is cured, and then come along with the combine and pick it up and thrash it. for this style of harvest the combine has whats called a "pickup header" on it.
so now in the south first the combine was upgraded and got whats called a "straight cut header" put on it. in the south things dry better and faster with more heat so there was no need to swath the wheat first to let it dry. so it was basically like putting the swather header on the combine. one pass, cut and thrash the grain. now days we have different grains that cure faster, and for the most part in the wheat harvest its almost all straight cut headers on combines. we still swath things like canola and barley,lentals,flax.
there are many around that used the A engine