A history of the growth of the steam-engine . remembered, non-condensing; but the first plan of anon-condensing engine that could be made of any reallypractical use is given in the Theatrum Machinarum ofLeupold, published in 1720. This sketch is copied in It is stated by Leupold that this plan was suggestedby Papin. It consists of two single-acting cylinders, r s, re-ceiving steam alternately from the same steam-pipe througha four-way cock, x, and exhausting into the is furnished by the boiler, a, and the pistons, c d,are alternately raised and depressed, depressing an
A history of the growth of the steam-engine . remembered, non-condensing; but the first plan of anon-condensing engine that could be made of any reallypractical use is given in the Theatrum Machinarum ofLeupold, published in 1720. This sketch is copied in It is stated by Leupold that this plan was suggestedby Papin. It consists of two single-acting cylinders, r s, re-ceiving steam alternately from the same steam-pipe througha four-way cock, x, and exhausting into the is furnished by the boiler, a, and the pistons, c d,are alternately raised and depressed, depressing and raisingthe pump-rods, k I, to which they are attached by the beams,h g, vibrating on the centres, * i. The water from thepumps, op, is forced up the stand-pipe, q, and dischargedat its top. The alternate action of the steam-pistons is se- 148 THE MODERN STEAM-ENGINE. cured by turning the four-way cock, x, first into the po-sition shown, and then, at the completion of the stroke, intothe reverse position, by which change the steam from the. 41.—Leiipold8 Engine, 1720. boiler is then led into the cylinder, s, and the steam in r isdischarged into the atmosphere. Leupold states that he is indebted to Papin for the sug-gestion of the peculiar valve here used. He also proposedto use a Savery engine without condensation in raisingwater. We have no evidence that this engine was everbuilt. The first rude scheme for applying steam to locomotionon land was probably that of Isaac Newton, who, in 1680,proposed the machine shown in the accompanying figure(42), which will be recognized as representing the scientific • Vide Theatrum Machinarum, vol. iii., Tab. 30. STEAM-LOCOMOTION ON BAILROADS. 149 toy whicli is found in nearly every collection of illustrativephilosophical apparatus. As described in the Explanationof the Newtonian Philosophy, it consists of a sphericalboiler, B, mounted on a carriage. Steam issuing from the
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