. Bulletin - United States National Museum. Science. CATALOGUE OF THE MECHANICAL ENGINEERING COLLECTION. 57 to a cross shaft. The forward end of the horizMiital extension of each lever is attached to the wrists of the crank shafts. These crank shafts are aligned but independent, and in place of constructing each of them in one continuous angular piece it is formed in two parts, which are rigidly connected by an interposed annulus. The wrists of these two parts are attached to the annulus at opposite points on its side and the forward end of the walking legs are also attached at the same points
. Bulletin - United States National Museum. Science. CATALOGUE OF THE MECHANICAL ENGINEERING COLLECTION. 57 to a cross shaft. The forward end of the horizMiital extension of each lever is attached to the wrists of the crank shafts. These crank shafts are aligned but independent, and in place of constructing each of them in one continuous angular piece it is formed in two parts, which are rigidly connected by an interposed annulus. The wrists of these two parts are attached to the annulus at opposite points on its side and the forward end of the walking legs are also attached at the same points, the revolution of the crank shaft and its annulus imparting a complex movement to the walking legs. This movement is not unlike that of the hind legs of a FIG. 23. PEAUL STEAM TRACTOR, 1879. When in operation the feet of each pair of legs will be alternately lifted from the ground and carried forward and again brought down, thus describing an approximately elliptical figure, while the legs as a whole will have a forward and backward movement, alter- nately rising and falling in consequence of the overhead links vibrat- ing in the arc of a circle. The vertical extension of the legs is nearly aligned with the links overhead and the feet move in nearly a hori- zontal plane, so that the rear part of the body of the engine is carried smoothly or has a scarceh^ perceptible rising and falling movement during the time the legs are making their backward movement. A vertical boiler and the engine are carried on the rear. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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