661. Sediment-Liquefier.—Find a chemical substance that will liquefy the residual substances in barrels. There would be an enormous demand for a composition that would do the work effectively.
662. Fire Kindler.—A material which will kindle both wood and coal without addition of paper, shavings, or any other article.
663. Egg Preserver.—No process has yet been found for preserving eggs for months and keeping them as fresh as newly-laid ones. Here is the chance for the practical chemist.
664. Mosquito Annihilator.—The greatest pest is the mosquito. If some chemical could be found which could be squirted liberally upon the marshes, which are the breeding place of the mosquito, and thus annihilate the pest, a long suffering public would shower its benefactor with gold.
665. Artificial Fuel.—There is needed a fuel that can be produced as cheap as wood for use in the spring and fall, when the weather is too mild for the use of the furnace.
666. The Flamless Torch.—There are hogsheads full of money for the man who will invent an igniter which will cause combustible matter to burn, but will not itself flame—a device which can ignite a lamp instantly by a thrust down the chimney, or light the gas without the usual hunt for a match.
667. Chemical Eraser.—Some chemical should be produced which will effectively erase the marks of a pen and leave the paper the same as before.
Section 20. Money in Tools.
668. The Instantaneous Wrench.—A monkey wrench, the jaws of which may be adjusted instantly, instead of by the screwing process now in vogue.
669. The Double Channeled Screw Head.—A screw in which the head has two channels instead of one, crossing each other at right angles.