ClipArt ETC
Sir Robert S. Ball's Theory of Screws.

Theory of Screws

Sir Robert S. Ball's Theory of Screws.

"Rotate the disk slowly, blowing meanwhile through a tube of about 3/16 inch bore, the nozzle of the tube being held opposite the interior ring of holes. As each successive hold comes before the end of the tube, a puff of air goes through the disk. As the speed of the disk increases, the puffs become more frequent, and finally blend into a whizzing sound in which the ear can detect a smooth tone. As the disk is given an increasing velocity, this tone rises in pitch." -Avery 1895

Siren

"Rotate the disk slowly, blowing meanwhile through a tube of about 3/16 inch bore, the nozzle of the…

In this illustration, "the driven surface of the slide coincides with the tangent to the spiral, the line of centres being from o through c to infinity and perpendicular to the direction of motion of the slide.""

Logarithmic Spiral Sector

In this illustration, "the driven surface of the slide coincides with the tangent to the spiral, the…

Illustration of 4 concentric squares that are equally spaced.

4 Concentric Squares

Illustration of 4 concentric squares that are equally spaced.

A wheel is a circular device that is capable of rotating on its axis, facilitating movement and transportation.

Side View of a Vehicle Wheel

A wheel is a circular device that is capable of rotating on its axis, facilitating movement and transportation.

"Rotation of a Wheel. The same force which throws the wire away from the mercury, will cause the rotation of a spur-wheel. For this purpose the conducting wire, instead of being suspended, as in the former experiment, must be fixed firmly to the arm. A support for the axis of the wheel may be made by soldering a short piece to the side of the conducting wire, so as to make the form of a fork, the lower end of which must be flattened with a hammer, and pierced with fine orifices, o recieve the ends of the axis." —Comstock, 1850

Wheel Rotation

"Rotation of a Wheel. The same force which throws the wire away from the mercury, will cause the rotation…

A tire is a ring shaped covering that fits around a wheel to protect it and enable better vehicle performance by providing a flexible cushion that absorbs shock while keeping the wheel in close contact with the ground.

Rubber Made Wheel Tire

A tire is a ring shaped covering that fits around a wheel to protect it and enable better vehicle performance…