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A. H. Allcroft ABCD algebraic sum applied arithmetic mean attached balance base beam bisecting centre of gravity components conditions of equilibrium couple denote diagonal distance effort equal and opposite equation of moments find the C.G. find the resultant ft.-lbs fulcrum given force Hence horizontal inclined plane intersect lamina length lever line of action LL.B M.A. Lond M.A. Oxon magnitude and direction mechanical advantage middle point move moveable pulleys number of forces Parallelogram of Forces particle perpendicular placed point of application polygon Principle pull pyramid Q acting reaction represented in magnitude resistance resolved respectively rest resultant force right angles rigid body rope round rowlock scale pan screw sides smooth steelyard straight line string support a weight system of pulleys taking moments Text-Book three forces triangle ABC Triangle of Forces true weight turn vertex wheel and axle zero
Page 70 - Prove that the algebraic sum of the moments of two concurrent forces about any point in their plane is equal to the moment of their resultant about the same point.
Page 231 - Mr. Mackenzie's book is as nearly perfect as it could be. It covers the whole field, and for perspicuity and thoroughness leaves nothing to be desired. The pupil who masters it will find himself equipped with a sound grasp of the subject such as no one book with which we are acquainted has hitherto been equal to supplying. Not the least recommendation is the really interesting style of the work.
Page 229 - The parts of speech are dealt with historically as well as grammatically. The work is scholarly and accurate." — Schoolmaster. "The history of the language and etymology are both well and fully treated." — Teachers' Monthly. "Aptly and cleverly written.
Page 226 - The more advanced portions of the book-work are denoted by an asterisk, and the relative importance of rules and exceptions is shown by variety of type. Each Exercise is divided into three sections of progressive difficulty. "This useful little book.
Page 127 - Find the ratio of the power to the weight, when there is equilibrium in the system of pulleys in which each pulley hangs by a separate string ; first, neglecting, secondly, taking account of the weights of the pulleys.
Page 11 - If any number of forces acting at a point can be represented in magnitude and direction by the sides of a POLYGON taken in order, they are in equilibrium.
Page 228 - Containing passages in prose and verse representative of all the modern Authors. Edited by S. BARLET, B. es Sc.. Examiner in French to the College of Preceptors, and WF MASOM, MA Lond.
Page 222 - The work of men who have proved themselves to be possessed of the special qualifications necessary." — School Guardian. " By this time every one knows the material and uniform excellence of this series." — Practical Teacher. "The evident care, the clearly conceived plan, the genuine scholarship, and the general excellence of the productions in this series, give them, for the special purpose they are intended to accomplish, high claims to commendation — especially the commendation of diligent...
Page 229 - ... critical extracts are judiciously chosen, and Mr. Low's own writing is clear, effective for its purpose, and evidently the result of thorough knowledge and a very considerable ability to choose between good and bad." — National Observer. "It affords another example of the author's comprehensive grasp of his subject, combined with a true teacher's power of using such judicious condensation that the more salient points are brought clearly into view.