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Archimedean screw, gravity principle. Illustration of an unsuccessful scheme for a perpetual-motion device.

Archimedean Screw

Archimedean screw, gravity principle. Illustration of an unsuccessful scheme for a perpetual-motion…

Buoyancy chambers, hydrostatic principle. Illustration of an unsuccessful scheme for a perpetual-motion device.

Buoyancy Chambers

Buoyancy chambers, hydrostatic principle. Illustration of an unsuccessful scheme for a perpetual-motion…

Felt Comptometer computing machine.

Felt Comptometer

Felt Comptometer computing machine.

Leibnitz computing machine.

Leibnitz Computing Machine

Leibnitz computing machine.

Liquids of varying densities. Illustration of an unsuccessful scheme for a perpetual-motion device.

Liquids of Varying Densities

Liquids of varying densities. Illustration of an unsuccessful scheme for a perpetual-motion device.

Magnetic attraction on inclined plane. Illustration of an unsuccessful scheme for a perpetual-motion device.

Magnetic Attraction

Magnetic attraction on inclined plane. Illustration of an unsuccessful scheme for a perpetual-motion…

Magnetic pendulum, rotating field principle. Illustration of an unsuccessful scheme for a perpetual-motion device.

Magnetic Pendulum

Magnetic pendulum, rotating field principle. Illustration of an unsuccessful scheme for a perpetual-motion…

Overbalancing wheel, gravity principle. Illustration of an unsuccessful scheme for a perpetual-motion device.

Overbalancing Wheel

Overbalancing wheel, gravity principle. Illustration of an unsuccessful scheme for a perpetual-motion…

Pascal computing machine.

Pascal Computing Machine

Pascal computing machine.

Schematic connection diagram for a grounded-neutral, three-phase electrolytic protector.

Protector

Schematic connection diagram for a grounded-neutral, three-phase electrolytic protector.

Diagram of a rifle.

Diagram of a rifle

Diagram of a rifle.

Sponge plan, capillary principle. Illustration of an unsuccessful scheme for a perpetual-motion device.

Sponge Plan

Sponge plan, capillary principle. Illustration of an unsuccessful scheme for a perpetual-motion device.

"The transmitter is a microphone adapted for the transmission of telephone messages and, in general practice, is so used, better results being thus secured than is possible when the transmitter and receiver are identical. In the Blake transmitter, a diagram is supported back of a mouthpiece, as in the Bell telephone."

Blake transmitter

"The transmitter is a microphone adapted for the transmission of telephone messages and, in general…

An early helicopter concept.

Villard's Helicopter

An early helicopter concept.