Excerpt from Report on the Atmospheric Railway System I entrusted them to two talented and experienced assistants, Mr. George Berkley and Mr. Wm. P. Marshall, who have carefully tabulated the results. I will now proceed, without further introduction, to explain the principles upon which I conceive the Atmospheric Railway apparatus to act, and will then refer to the experiments individually, and point out the conclusions that may be deduced from them. The mechanical details of the apparatus employed at Kingstown have been ...
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Excerpt from Report on the Atmospheric Railway System I entrusted them to two talented and experienced assistants, Mr. George Berkley and Mr. Wm. P. Marshall, who have carefully tabulated the results. I will now proceed, without further introduction, to explain the principles upon which I conceive the Atmospheric Railway apparatus to act, and will then refer to the experiments individually, and point out the conclusions that may be deduced from them. The mechanical details of the apparatus employed at Kingstown have been brought to a remarkable degree of perfection by the ingenious and highly gifted inventor, Mr. Clegg; but these it is quite needless for me to occupy any time in describing, because they are not involved in the present inquiry. It is the general principle of the invention alone that we have now to consider, and this is so simple that I am unwilling to introduce any thing which can tend to complicate the investigation. For the purposes of the present Report, we need therefore only consider the Atmospheric Railway to consist of air pumps placed at intervals upon a railway, and connected with a tube lying along the whole line: this tube being partially exhausted of air by means of the pumps, the pressure of the atmosphere is made to propel a piston, moving in the tube and connected with a train. In order to explain the action of this apparatus, let us suppose A B in the above figure to represent the tube lying along the railway, and a the piston which is required to be moved with the train towards B. Assuming in the first instance no train to be attached, the piston will be advanced, during one stroke of the air pump, through a space a b in the tube, the content of which is equal to the content of the air pump, and each succeeding stroke of the air pump will produce a similar advance in the tube. It is evident therefore that the maximum velocity of the train is determined by the proportion existing between the areas of the air pump and tube, and the velocities of the air pump piston and the piston in the tube must obviously be in the inverse proportion of the squares of their diameters. For example, at Kingstown, the diameter of the air pump piston is 67 inches, and that of the tube piston 15 inches; the velocity of the former is 253 feet per minute, or nearly 3 miles an hour, and hence the utmost velocity attainable by the latter will be about 60 miles an hour. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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