Great for the Amish as they do not use electric, but I guess they do use gas motor. I have seen them pulling a brush hog with a team of horses with a gas motor running the blade. I admire then for their conviction and the way they stick to it BUT! don't understand all I know about it
Right after WWll I went to a barn raising with my dad and grandfather. Grand dad was the master carpenter on the job and it was a timber-built structure using big wood pins to hold the frame together.
Someone brought a gas engine saw that had a blade like an old crosscut saw that ran in a bar, slotted somewhat like a chain saw. That thing was war surplus, designed to be used by two men with handles on the motor and bar ends and made short work of cutting those big timbers. It was not usable for cutting the intricate joints needed but was good for cutting lengths. The cutting bar could be rotated to allow angle and horizontal cuts while the 4 cycle engine remained upright.
Later Western Auto had a similar saw under the Wizard brand but it was much lighter in weight and a two cycle. Later they came out with a circular saw much like Kevin's find. Neither of the Wizard's seemed to sell very well, at least in this area. When the electricity became available on the farms the saws of this type disappeared for the most part.
Haven't seen one like that pictured but the concept has been around for awhile.