TABLE OF SPECIFIC GRAVITIES.
Metals.Iron,(cast)7·207„(wrought)7·688Steel(soft)7·780„(tempered)7·840Lead(cast)11·400„(sheet)11·407Brass(cast)8·384„(wire drawn)8·544Copper(sheet)8·767„(cast)8·607Gold(cast)19·238„(hammered)19·361Gold(22 carats)17·481„(20 „ )15·709Silver(pure, cast)10·474„(hammered)10·511Mercury(60°)13·580Pewter7·248Tin7·293Zinc(cast)7·215Platinum21·500Antimony6·712Arsenic5·763Bronze(gun metal)8·700Stones and Earth.Coal(Bituminous)1·256„(Anthracite){1·4361·640Charcoal·441Brick1·900Clay1·930CommonSoil1·984Emery4·000Glass(plalte)3·248Ivory1·822Grindstone2·143Diamond3·521Gypsum2·168Lime2·720Granite2·625Marble2·708Mica2·800Millstone2·484Nitre1·900Porcelain2·385Phosphorus1·770Pumice Stone·915Salt2·130Sand1·800Slate2·672Sulphur2·033Woods.Ash·845Beech·852Birch·720Oak1·120Pine(yellow)·660„(white)·554Cherry·715Cork·240Elm·671Poplar·383Walnut·671Willow·585Liquids.AcidSulphuric1·851„Muriatic1·200Spiritsof Wine·917Alcohol·790Oil(turpentine)·870„(olive)·915Oil(linseed)·932„(castor)·961Purewater1·000Vinegar1·080Milk1·032Sea water1·029
To Find the Weight of a Cubic Foot of Anything Contained in these Tables.
Rule.Multiply 62·5 lbs. (the weight of a cubic foot of pure water) by the specific gravity of the given body.
Example.What is the weight of a cubic foot of sea water?
62·5 lbs.1·029 sp. gravity.——–56251250625———–Answer, 64·3125 lbs. is the actual weight: but 64 lbs. is taken in practice as the weight of a cubic foot of sea water.
Example.How many cubic feet of sea water will weigh a ton?
Divide 2240 lbs. (1 ton) by 64 lbs.
{ _8)224064 { ——{ 8) 280——Ans. 35
Example.What is the weight of a cubic foot of wrought iron?
62·5 lbs.7·69 sp. gravity.——–562537504375———-Answer, 480·625 lbs.
480 lbs. in practice is the weight of 1 cubic foot of wrought iron.
Note.—35 cubic feet of sea water is accounted to be a ton, as in sea water ballast for steamers, and in calculating displacement of ships.
Note.—35 cubic feet of sea water is accounted to be a ton, as in sea water ballast for steamers, and in calculating displacement of ships.
Example.What is the average weight of a cubic foot of Bituminous coal?
1·256 sp. gravity.62·5 lbs.——–628025127536———–Answer, 78·5000 lbs.
This 78·5 lbs. is the weight of a cubic foot in asolid block, but loose, as used for fuel, a cubic foot weighs about 49.7 lbs. which is the average of 13 kinds.
Example.What is the weight of a solid cast cylinder of copper, 4 inches diameter and 6 inches high?
8·607 sp. gravity.62·5 lbs.——-430351721451642————537·9375 lbs. per cub. ft.————Say 538 lbs.·785416 diam. squared.——–471247854——–12·5664 area of base.6 high———–75·3984 cu. in. in volume———–Say 75·4 cubic inches.cub. in.cub. in.lbs.Then, as 1728 : 75·4 :: 538 : Answer.538——603222623770————{ 12)40565·2{ ————–1728 { 12)3380·433{————–{ 12) 281·702———–23·475 lbs.Answer, 231⁄2lbs. nearly.