To find the capacity of any tank in gallons: Square the diameter in inches, multiply by the length, and then by .0034.
In making patterns for aluminum castings provision must be made for shrinkage to a greater extent than with any other metal or alloy.
The toughness of aluminum can be increased by adding a small per cent. of phosphorus.
All alloys of metals having mercury are called amalgams.
A sheet of zinc suspended in the water of a boiler will produce an electrolytic action and prevent scaling to a considerable extent.
Hydrofluoric acid will not affect a pure diamond, but will dissolve all imitations.
A strong solution of alum put into glue will make it insoluble in water.
A grindstone with one side harder than the other can have its flinty side softened by immersing that part in boiled linseed oil.
One barrel contains 3 3/4 cubic feet.
One cubic yard contains 7 barrels.