670. The Double Power Screw Driver.—The last invention requires another, a screw driver, also double at the end, by means of which twice the power may be acquired in the insertion of screws.
671. The Multiple Blade Parer.—A knife with several blades so arranged as to cut the skin of the fruit on all sides at once, and with a gauge to fit it to any size of fruit.
672. Knife Guard.—A knife with a guard for peeling fruit, preventing the fruit from being pared too deep.
673. The All-Tool.—A pocket device on the principle of a many-bladed knife, except that instead of blades the things which open from the handle, besides the single blade, are a saw, gimlet, file, cork-screw, screw driver and other useful tools.
674. A Nail Carrying Hammer.—A device for holding nails to a hammer. Carpenters would work twice as fast.
Section 21. Money in the Cars.
675. A Speed Indicator.—A contrivance for determining the speed of street railway cars. The speed is governed by law, but there is no practical means for determining how great it is. The laws of all our cities will insure the success of such an invention.
676. Automatic Car-Coupler.—A device is needed whereby the simple impact of one car upon another will cause a coupling-pin to be inserted in place. If you can contrive a system by which cars can be coupled by the same mechanism now employed for air-brakes, every one of the million or more cars on our railways will be equipped with it.
677. The Fender Car-Brake.—A fender so constructed that when it strikes an obstacle a brake is released which binds the wheels. Hundreds of lives would be saved every year. Companies which now pay heavy sums for loss of life and limb would buy such an invention on most liberal terms.
678. Folding Car-Step.—To avoid the difficulty of alighting from a car or of climbing into one when a car is not at a platform, invent a step which folds up when not in use.