. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 300 THI<: CIVIL I5NGINEKR AND ARCHITECTS JOURNAL. [October, with the weights a, b, c,. .at the respective ilislance log A, log B, log C,. .fioni the point of suspension. Involution, evolution, compound rule of three, and many other c;d- culations of that kind, are but very particular cases of the preceding fonnula. REVIE^VS. An Esaay uii the Bvikrs of Skam Engines. By R. Armstrong, Civil Engineer. London, Jolm Weale, 1839. A new edition of this excellent work has appeared
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 300 THI<: CIVIL I5NGINEKR AND ARCHITECTS JOURNAL. [October, with the weights a, b, c,. .at the respective ilislance log A, log B, log C,. .fioni the point of suspension. Involution, evolution, compound rule of three, and many other c;d- culations of that kind, are but very particular cases of the preceding fonnula. REVIE^VS. An Esaay uii the Bvikrs of Skam Engines. By R. Armstrong, Civil Engineer. London, Jolm Weale, 1839. A new edition of this excellent work has appeared with additions, making it more complete, and consequently more deserving tlie atten- tion of the public, tlie various rules and practical data which abound in it, entitle it to be considered a text-book for boiler makers, as well as boiler users. Having largely quoted from its contents in our former notices, nothing of a very material character presents itself, which we can transfer into our pages, but perhaps the following may be inte- resting to some of our readers:— General Rules for proporiionhig Hip leiu/th of Boilers. Rule I. A plain boiler mthout any inside flno, to he hung upon what is called the " oven plan,"* ought not to exceed in length six times the square root of the horse power in feet, or in ordinaiy circumstances, six times tlie square root of the area of the fire-grate in feet. Rule II. A boiler without any inside flue, to he set up in the common way with a wheel draught, ought not to exceed in leagth four times the square root of the horse power; or four times the square root of the area of the fire-grate in feet. Rule III. If a fined boiler, or boiler containing one or Inore inside flues, (and the latter pass quite through,) is to be set up with a sjilit draught, it ought not to exceed in length three and a half times the square root of the horse power, and if ^^'ith a wheel draught, three and a quarter times the same, or three and a quarter time
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