Gutta Percha Pipe-For Water, Beer, Soda, or Acid. Bishop Gutta Percha Works.. New York.... .See Page 34 Hammer Dies. To find the Strain that may be applied to a Hempen Rope with Safety. Circumference. Pounds. Circumference. Pounds. Circumference. Pounds. 6612 To find the Strain that may safely be applied to a good Hempen Cable. Circumference. Pounds. Circumference. Pounds. Circumference. Pounds. To Ascertain the Strength of Cables.-Multiply the square of the circumference in inches by 120, and the product is the weight the cable will bear in pounds, with safety. To Ascertain the Strength of Ropes.-Multiply the square of the circumference in inches by 20', and it gives the weigth the rope will bear in pounds, with safety. To Ascertain the Weight of Manilla Ropes and Hawsers.-Multiply the square of the circumference in inches by .03, and the product is the weight in pounds of a foot in length. This is but an approximation, sufficiently correct for many purposes. Woodward's, French's Screw, Excelsior Reflector, Sweeny's and Avery's Railroad Lanterns AND AMBROSE'S PATENT NO CHIMNEY STREET AND CAR LAMPS. ALSO, Street Lamps for Light Oil with Patent Burners. S. M. AIKMAN & CO., 261 PEARL ST., NEW YORK. Degrees. EFFECT OF HEAT UPON VARIOUS BODIES. (Condensed from Haswell.) Wedgewood's zero is 1077° of Fahrenheit, and each degree = 130°. In the designation of the degrees of temperature, the symbol when the temperature is above 0; but when it is below, the symbol Ammonia Boils.... is omitted is prefixed. Degrees. red hot in twilight.... 884 Antimony melts...... 951 Lead melts 504 Coal Tar boils..... 325 Cold, greatest artificial...... Sea-water freezes......... 28 Snow and Salt, equal parts.. Spirits of Turpentine freezes.. 0 14 ....... 2500 Gutta-percha softens..... Heat, cherry red................. (Daniell) bright red.... CC red visible by day.. 1077 (wrought) melts.. |