. Bulletin - United States National Museum. Science. CATALOGUE OF THE MECHANICAL ENGINEERING COLLECTION. 83 wheels were made of cast-iron with hollow spokes and rim, which at that time was a remarkable novelty. The section of the spokes was of the old form, and the rim was of very much the same shape as that in use at the present time. Another important improvement adopted in the construction of this locomotive was counterbalancing the weight of cranks, connecting rods, and piston. This counter- balancing was effected by casting the rim of the wheel opposite the crank in solid metal, while the
. Bulletin - United States National Museum. Science. CATALOGUE OF THE MECHANICAL ENGINEERING COLLECTION. 83 wheels were made of cast-iron with hollow spokes and rim, which at that time was a remarkable novelty. The section of the spokes was of the old form, and the rim was of very much the same shape as that in use at the present time. Another important improvement adopted in the construction of this locomotive was counterbalancing the weight of cranks, connecting rods, and piston. This counter- balancing was effected by casting the rim of the wheel opposite the crank in solid metal, while the other part of the wheel was made hollow. The importance of counterbalancing was not recognized until several years after it had been introduced by Rogers, Ketcham. and Company, and when attention Avas drawn to it many doubted the necessity of balancing anything more than the crank. Cat. No. 180,245 FIG. 38. ROGERS, KETCHAM & CO. " SANDUSKV '' LOCOMOTIVE, 1837. Model of Locomotive Invented by Asa Whitney, TJ. S. Patent No. 1653, June 27, 1840. Transferred from the United States Patent Office. To secure greater traction, this locomotive was designed to operate all wheels as drivers. The boiler, cylinders, etc., are secured to a framework supported on two four-wheel trucks. The forward truck is free to revolve about a center pin through the intervention of coni- cal friction rollers traveling through circular arcs, and the rear truck likewise is equipped with rollers that it may conform to the curva- tures and undulations of the track. The power of the engine is transmitted to the wheels through two bell cranks and other connecting rods and cranks above and on each side of the boiler to a main central sliaft beneath the boiler on which. 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
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
