it into the
wood as much as possible, then with a cooler iron melt on a coat thick
enough to completely cover the wood. For brassing small articles: To one
quart water add half an ounce each of sulphate copper and protochloride
of tin. Stir the articles in the solution until the desired color is
obtained. Use the sulphate of copper alone for a copper color. A good
cement for celluloid is made from one part shellac dissolved in one part
of spirit of camphor and three to four parts of ninety per cent.
alcohol. The cement should be applied warm, and the broken parts
securely held together until the solvent has entirely evaporated. Tin
and tin alloys, after careful cleansing from oxide and grease, are
handsomely and permanently bronzed if brushed over with a solution of
one part of sulphate of copper (bluestone) and one part of sulphate of
iron (copperas) in twenty parts of water. When this has dried, the
surface should be brushed with a solution of one part of acetate of
copper (verdigris) in acetic acid. After several applications and
dryings of the last named, the surface is polished with a soft brush and
bloodstone powder. The raised portions are then rubbed off with soft
leather moistened with wax in turpentine, followed by a rubbing with dry
leather.

Protecting Water-Pipes Against Frost.--A device has been brought
forward for protecting water-pipes against freezing, the arrangement
being based upon the fact that water in motion will remain liquid at a
lower temperature than water at rest. One end of a copper rod, placed
outside the building, is secured to a bracket, and the other end is
attached to one arm of a weighted elbow lever; to the other arm of the
lever is secured a rod which passes into the building and operates a
valve in the water-pipe. By means of turn buckles the length of the
copper rod can be adjusted so that before the temperature reaches
the point at which there would be danger of the water in the pipes
freezing the valve will be opened to allow a flow of water; beyond
this point the valve opening will increase and the flow become more
rapid as the cold becomes more intense, and as the temperature rises
the valve is closed. This plan sets up a current in the pipes, which
replaces the water as it grows cold by the warmer water from the main.

Destructive Work of Barnacles.--Unless some paint can be found which
is proof against barnacles, it may be necessary to sheath steel
vessels with an alloy of