The Practical Engineer's Pocket Guide: Containing a Concise Treatise on the Nature and Application of Mechanical Forces; Action of Gravity; the Elements of Machinery; Rules and Tables for Calculating the Working Effects of Machinery; of the Strength, Resistance, and Pressure of Materials; with Tables of the Weight and Cohesive Strength of Iron and Other Metals

Front Cover
Saxton and Kelt, 1847 - Mechanical engineering - 178 pages

Other editions - View all

Common terms and phrases

Popular passages

Page 101 - Multiply the square of the diameter of the cylinder in inches by the velocity of the piston in feet per minute, and -divide the product by 6,000 ; the quotient is the number of nominal horses power.
Page 60 - Flexure by vertical Pressure. When a piece of timber is employed as a column or support, its tendency to yielding by compression is different according to the proportion between its length and area of its cross section ; and supposing the form that of a cylinder whose length is less- than seven or eight times its diameter, it is impossible to bend it by any force applied longitudinally, as it will be destroyed by splitting before that bending can take place; but when the length exceeds this, the...
Page 30 - From half the sum of the three sides, subtract each side severally; multiply the half sum, and the three remainders together, and the square root of the product will be the area required. Example. — Required the area of a triangle, whose sides are 50, 40, and 30 feet. 50 + 40+30 ; — 60, half the sum of the three sides.
Page 17 - To inscribe any regular polygon in a given circle Divide any diameter, as AB, into so many equal parts as the polygon is required to have sides ; from A and B as centres, with a radius equal to the diameter, describe arcs cutting each other in C ; draw the line CD...
Page 39 - To find the convex surface, solidity, or capacity oj a cone or pyramid. Rule 1. — Multiply the circumference of the base by the slant height, and half the product is the slant surface.
Page 41 - To twice the length of the base add the length of the edge ; multiply the sum by the breadth of the base, and by one-sixth of the height.
Page 60 - When the length of a cast iron column with flat ends equals about thirty times its diameter, fracture will be produced wholly by bending of the material ; — when of less length, fracture takes place partly by crushing and partly by bending : but, when the column is enlarged in the middle of its length from one and a half to twice its diameter at the ends, by being cast hollow, the strength is greater by ^-th than in a solid column containing the same quantity of material.
Page 10 - From the middle point b as a centre, with any radius, as bc, bd, describe a portion of a circle, as csd; and from r and t as centres, with an equal radius, cut the portion of the circle in cs and ds; draw lines through where the arcs cut each other, and the intersection of the lines at * is the centre of the circle as required.
Page 146 - The whole numbers of the series of logarithms, as 1, 2, 3, &c., are called the indices, or characteristics of the logarithm, and which must be added to the logarithm obtained by the Table, in proportion to the number of figures contained in the given sum. Thus, suppose the logarithm be required for a sum of only two figures, the index is 1 ; if of three figures, the index is 2 ; and if of four figures, the index is 3, &c., being always a number less by unity than the number of figures the given sum...
Page 55 - To determine the absolute strength of a rectangular beam of timber when supported at both ends, and loaded in the middle of its length, as beams in general ought to be calculated to, so that they may be rendered capable of withstanding all accidental cases of emergency. Rule. — Multiply the tabular value of S by four times the depth of the beam in inches, and by the area of the cross section in inches...

Bibliographic information