THE PRACTICAL MODEL CALCULATOR, FOR THE ENGINEER, MECHANIC, MACHINIST, MANUFACTURER OF ENGINE-WORK, NAVAL ARCHITECT, MINER, AND MILLWRIGHT. Compiler and Editor of the "Dictionary of Machines, Mechanics, Engine-work, and Engineering;" Author of "The Companion for Machinists, Mechanics, and Engineers;" Author and Inventor of a New Science, termed "The Calculus of Form," a substitute for the differential and Integral Calculus; "The Elements of Euclid by Colours," and numerous other Mathematical and Mechanical Works. Surveyor-General of the English Settlements in the Falkland Isles. Professor of OF THR UNI EROTI Y PHILADELPHIA: HENRY CAREY BAIRD, B& Entered according to the act of Congress, in the year 1851, by HENRY CAREY BAIRD, in the Clerk's Office of the District Court for the Eastern District of Pennsylvania. 78224 UNIT THE PRACTICAL MODEL CALCULATOR. WEIGHTS AND MEASURES. THE UNIT OF LENGTH. THE YARD.-If a pendulum vibrating seconds in vacuo, in Philadelphia, be divided into 2509 equal parts, 2310 of such equal parts is the length of the standard yard; the measures are taken on brass rods at the temperature of 32° Fahrenheit. This yard will not be in error the ten-millionth part of an inch. 2310 2509 as 1 to 1.086142 nearly. THE UNIT OF WEIGHT. The Pound, avoirdupois, is 27-7015 cubic inches of distilled water, weighed in air, at the temperature of maximum density, 39-82; the barometer at 30 inches. THE LIQUID UNIT. The Gallon, 231 cubic inches, contains 8-3388822 pounds avoirdupois, equal 58372-1754 grains troy of distilled water, at 39°-82 Fah.; the barometer at 30 inches. UNIT OF DRY CAPACITY. The Bushel contains 2150-42 cubic inches, 77-627412 pounds avoirdupois, 543391.89 grains of distilled water, at the temperature of maximum density; the barometer at 30 inches. The French unit of length or distance is the metre, and is the ten-millionth of the quadrant of the globe, measured from the equator to the pole. The French Metre 3.2808992 English feet linear measure = 39-3707904 inches. For Multiples the following Greek | For Divisors the following Latin words are used: words are used: 10 times. Deci for the 10th part. Deca for ....... Hecto Kilo Myria 100 times. Centi 1000 times. Milli 100th part. 1000th part. = 1000 metres. 10000 times. Thus a Kilometre The square Deca Metre, called the Are, is the element of land. measure in France, which = 1076-42996 square feet English. The Stere is a cubic metre 35-316582 cubic feet English. |