ClipArt ETC
"Three drill bits. The first the old, bad, but not yet quite superseded pattern, which is incapable of making a straight or clean hole of any considerable depth, and which loses its original diameter both in wear and in sharpening; the second the twist drill, which compares favourably with it in every one of these respects; and the third a pin drill, for enlarging a hole already existing." —The Encyclopedia Britannica, 1903

Drill Bits

"Three drill bits. The first the old, bad, but not yet quite superseded pattern, which is incapable…

Twist drill bit.

Twist Drill

Twist drill bit.

This machine is used to weave cloth, the purpose of any loom is to hold the warp threads under tension.

Weaving Loom

This machine is used to weave cloth, the purpose of any loom is to hold the warp threads under tension.

"Power is applied to the head of the screw. Each time the screw is turned into the nut, it advances the distance between two of the threads and compresses to that extent any fixed object against which it is directed." —Quackenbos 1859

Screw and Nut

"Power is applied to the head of the screw. Each time the screw is turned into the nut, it advances…

Sir Robert S. Ball's Theory of Screws.

Theory of Screws

Sir Robert S. Ball's Theory of Screws.

Any of various hand or power tools, often having fixed or adjustable jaws, used for gripping, turning, or twisting objects such as nuts, bolts, or pipes.

Pipe Wrench

Any of various hand or power tools, often having fixed or adjustable jaws, used for gripping, turning,…