"Four to five inches long; hides in the water among loose stones, feeds on the larvae of water-insects, and the ova and fry of fishes; it is very voracious, and easily caught with a hook baited with red worm." — Goodrich, 1859

River Bullhead

"Four to five inches long; hides in the water among loose stones, feeds on the larvae of water-insects,…

The board of trade sign for 7/8 cent.

7/8 Cent

The board of trade sign for 7/8 cent.

"If the conducting wire is bent into the form shown, the lines of force will pas around the wire from one face of the loop to the other, and in the direction indicated by the 'rule of thumb' just given." -Avery 1895

Magnetic Field Around a Current Carrying Wire

"If the conducting wire is bent into the form shown, the lines of force will pas around the wire from…

An illustration of hands depicting 0 European Style

European Style Counting Hands

An illustration of hands depicting 0 European Style

An illustration of hands depicting 1 European Style

European Style Counting Hands

An illustration of hands depicting 1 European Style

An illustration of hands depicting 2 European Style

European Style Counting Hands

An illustration of hands depicting 2 European Style

An illustration of hands depicting 3 European Style

European Style Counting Hands

An illustration of hands depicting 3 European Style

An illustration of hands depicting 4 European Style

European Style Counting Hands

An illustration of hands depicting 4 European Style

An illustration of hands depicting 5 European Style

European Style Counting Hands

An illustration of hands depicting 5 European Style

An illustration of hands depicting 6 European Style

European Style Counting Hands

An illustration of hands depicting 6 European Style

An illustration of hands depicting 7 European Style

European Style Counting Hands

An illustration of hands depicting 7 European Style

An illustration of hands depicting 8 European Style

European Style Counting Hands

An illustration of hands depicting 8 European Style

An illustration of hands depicting 9 European Style

European Style Counting Hands

An illustration of hands depicting 9 European Style

An illustration of hands depicting 10 European Style

European Style Counting Hands

An illustration of hands depicting 10 European Style

Little Jack Horner sat in a corner.

Jack Horner

Little Jack Horner sat in a corner.

Little Jack Horner sat in a corner.

Jack Horner

Little Jack Horner sat in a corner.

"Thumb and leg and foot of Mystacina tuberculata." —The Encyclopedia Britannica, 1903

Mystacina Tuberculata

"Thumb and leg and foot of Mystacina tuberculata." —The Encyclopedia Britannica, 1903

"Fleming's rule for direction of induced current. Extend the thumb, forefinger and middle finger of the right hand [as shown]. Place the hand [so that] the thumb will point in the direction in which the conductor moves, the forefinger in the direction of the lines of force (N to S), then will the middle finger point in the direction in which the induced current flows." -Hawkins, 1917

Right Hand Rule of Induced Current

"Fleming's rule for direction of induced current. Extend the thumb, forefinger and middle finger of…

The short, thick, finger of the human hand, or the corresponding member of animals.

Thumb

The short, thick, finger of the human hand, or the corresponding member of animals.

A hand expressing the negation of a situation with a 'thumbs down'.

Thumbs down

A hand expressing the negation of a situation with a 'thumbs down'.

A hand expressing the affirmation of a situation with a 'thumbs up'.

Thumbs up

A hand expressing the affirmation of a situation with a 'thumbs up'.