COLD STORAGE TEMPERATURES. — (Continued.) Tomatoes. 32-42 Watermelons. 34-40 Tobacco. 35–42 Wheat Flour. 40–42 Veal.. 32-36 Wines.. 40-50 Vegetables.. 34-40 Woolens. 25-35 THE DISTANCE IN NAUTICAL MILES BETWEEN COLON AND Acapulco Miles. 793 Salina Cruz. Miles. 1395 1970 1781 2629 3250 1750 3529 1949 774 3895 3295 4609 315 1029 1170 2843 3245 840 1565 4076 4547 1491 2983 2616 1426 4154 SECTION VII. MATHEMATICAL TABLES. (Reproduced by permission of Messrs. Lippincott from Suplee's Mechanical Engineers Reference Book.”) THE METRIC SYSTEM. The principal advantage of the metric system consists in its use of the 1 decimal subdivisions. The attempt to consider the metre as of 10,000,000 a quadrant of the earth's surface has been abandoned, and it is now held only to be the length of the standard known as the Mètre des Archives, copies of which are issued by the Bureau Internationale des Poids et Mésures, at Breteuil, near Paris. The kilogramme was originally intended to be the weight of a cubic decimetre or litre of pure water at the temperature of maximum density, but it is really now considered only as the weight of a platinum standard. At the same time, this relation between the unit of weight and a standard volume of water is sufficiently close for the specific gravity of any substance to be considered as equal to the weight of a cubic decimetre of that substance. In all hydraulic measurements a cubic metre of water is equal in weight to the metric tonne of 1000 kilogrammes, a most convenient fact in the determination of the power developed by a given fall and volume of water. The French Metrical System. The French units of weight, measure, and coin are arranged into a perfect decimal system, except those of time and the circle. The division and multiplication of the units are expressed by Latin and Greek names, as follows: Latin, Division. Greek, Multiplication. Milli 1000th of the unit. Deca 10 times the unit. Centi = 100th of the unit. Hecato 100 times the unit. Deci = 10th of the unit. Kilio 1000 times the unit. Metre, litre, stere, are, franc, Myrio 10000 times the unit. gramme. French Measure of Length. 1 millimetre 0.03937 inch. 1 metre (unit) 3.28083 feet. 1 centimetre 0.3937 inch. 1 decametre 32.8083 feet. 1 decimetre 3.937 inches. 1 hectometre 328.083 feet. 1 metre (unit) 39.37 inches. 1 kilometre 3280.83 ft. = 0.62137 1 sea mile =1853.25 metres. mile. 1 kilometre = 0.53959 sea mile. 1 statute mile 1.60935 kilomets. 1 kilometre 49.7096 chains. 1 square metre French Measure of Surface. 10.764 square feet. 1 are = 1076.4 square feet. 100 square metres. 1 decare 107.64 square feet. 10 ares. 1 hectare 2.471 Eng. acres. 100 ares. 1 square mile 259 hectares. 1 stere (cubic metre) 1 stere 1 litre 1 decistere French Measure of Volume. 1 stere 10 decasteres. = 35.314 Eng. cubic feet. 1 litre = 61.023 Eng. cub. inches. 1000 litres. 1 gallon 3.7854 litres. =1 cubic decimetre. 11 decistere - 2.838 bushels (nearly). 3.5314 cubic feet. French Measure of Weight. 1 ton = 1 cubic metre dis- | 1 gramme tilled water. 1 decigramme 1 ton = 1000 kilogrammes. 1 centigramme 1 kilogramme 1000 grammes. 1 kilogramme 1 hectogramme 100 grammes. 1 decagramme 10 grammes. 1 Eng. pound 1 gramme 1 cubic centimetre 1 gramme distilled water. 1 English ton 1 Tranch tan 10 decigrammes. oirdupois. n ne an |