which seems to give the best average performance under all conditions. We fixed upon a four-cylinder engine that is started by gasoline but runs thereafter on kerosene. The lightest weight that we could attain with strength was 2,425 pounds. The grip is in the lugs on the driving wheels—as in the claws of the cat.
In addition to its strictly pulling functions, the tractor, to be of the greatest service, had also to be designed for work as a stationary engine so that when it was not out on the road or in the fields it might be hitched up with a belt to run machinery. In short, it had to be a compact, versatile power plant. And that it has been. It has not only ploughed, harrowed, cultivated, and reaped, but it has also threshed, run grist mills, saw mills, and various other sorts of mills, pulled stumps, ploughed snow, and done about everything that a plant of moderate power could do from sheep-shearing to printing a newspaper. It has been fitted with heavy tires to haul on roads, with sledge runners for the woods and ice, and with rimmed wheels to run on rails. When the shops in Detroit were shut down by coal shortage, we got out the Dearborn Independent by sending a tractor to the electro-typing factory—stationing the tractor in the alley, sending up a belt four stories, and making the plates by tractor power. Its use in ninety-five distinct lines of service has been called to our attention, and probably we know only a fraction of the uses.
The mechanism of the tractor is even more simple than that of the automobile and it is manufactured in exactly the same fashion. Until the present year, the production has been held back by the lack of a suitable factory. The first tractors had been made in the plant at Dearborn which is now used as an experimental station. That was not large enough to affect the economies of large-scale production and it could not well be enlarged because the design was to make the tractors at the River Rouge plant, and that, until this year, was not in full operation.
Now that plant is completed for the making of tractors. The work flows exactly as with the automobiles. Each part is a separate departmental