ClipArt ETC
An illustration of a elastic aerial screw with twisted blades. "X, End of driving shaft; v,w, Sockets in which the roots of the blades of the screw rotate, the degree of rotation being limited by steel springs (z, s); ab, ef, Tapering elastic rods forming anterior or thick margins of blades of screw; d c, h g, Posterior or thin elastic margins of blades of screw. The arrows m, n, o, p, q, r, indicate the direction of travel." -Britannica, 1910

Elastic Aerial Screw with Twisted Blades Resembling Wings

An illustration of a elastic aerial screw with twisted blades. "X, End of driving shaft; v,w, Sockets…

An illustration of an "elastic spiral wing, which twists and untwists during its action, to for a mobile helix or screw. This wing is made to vibrate by a direct piston action, and b a slight adjustment can be propelled vertically, horizontally or at any degree of obliquity." -Britannica, 1910

Elastic Spiral Wing

An illustration of an "elastic spiral wing, which twists and untwists during its action, to for a mobile…

An illustration of a double elastic spiral wing.

Double Elastic Spiral Wing

An illustration of a double elastic spiral wing.

An illustration of elastic spiral wings of the gull. "a b, Anterior margin of the left wing; c d, Posterior margin of the ditto; d g, Primary or rowing feathers of left wing; g a, Secondary feathers ditto; x, root of right wing with ball-and-socket joint; l, Elbow joint; m, Wrist joint; n o, Hand and finger joints." -Britannica, 1910

Elastic Spiral Wings of the Gull

An illustration of elastic spiral wings of the gull. "a b, Anterior margin of the left wing; c d, Posterior…

A prosthetic limb that replaces a missing body part.

Artificial Leg

A prosthetic limb that replaces a missing body part.

The grill oblong panel was designed in 1649. It has an artificial motif.

Grill Oblong Panel

The grill oblong panel was designed in 1649. It has an artificial motif.

This is a toy pistol which simulates an actual pistol.

Toy Pistol

This is a toy pistol which simulates an actual pistol.