. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. ISi6.] THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. 301 Horizontal Water Wheels, Turbives ; thrir history, tonstruction, and Iheonj. By Moritz Ruhlhas. Edited bj Sir R. Kane. Dublin : Hodijes aud Smilli, 1840 ; small quarlo ; pp. 70. Six lithogra- phic platen. Notices of the and power of the turbines, or horizontal water-wheels, have appeared in this Journal in the volume for 1842, p. 203, and in the volume for 1814, p. 85 and p. The publicatio
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. ISi6.] THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. 301 Horizontal Water Wheels, Turbives ; thrir history, tonstruction, and Iheonj. By Moritz Ruhlhas. Edited bj Sir R. Kane. Dublin : Hodijes aud Smilli, 1840 ; small quarlo ; pp. 70. Six lithogra- phic platen. Notices of the and power of the turbines, or horizontal water-wheels, have appeared in this Journal in the volume for 1842, p. 203, and in the volume for 1814, p. 85 and p. The publication of the work before us enables us to give some further information respecting the practical results obiaiued from these machines. The present treatise is translated by the editor from the German, with the adilition of some notes and an introduction. The translation was un- dertaken on account of numerous inquiries from millwrights and engineers, addressed to Sir Robert Kane, in consequence of his having directed atten- tion to the turbine in his work on the " Industrial of ; He has selected for translation the present treatise by Professor Riihlman, as the most suitable for his purpose: at the same time he gives accounts of several other treatise's on the same subject. From one of these, that by M. Morin, we take what we consider a very important extract, because it exhibits the general practical eft'ects of turbines as determined, not from a doubtful theory, but from actual experience, and because these conclusions are conOrmed by the authority of a commission consisting of MM. Arago, Prony, Gambey, and Savary, appointed by the Academic des Sciences to report on the subject. The following are the genei al results of the investi- gation :— 1. That the wheels are applicable equally to great and to small falls of 2. That they transmit a useful effect, equal to from 70 to 78 per cent, of the absolute total moving force.* 3. That they may work at ver
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