A shaper micrometer scale measuring cross—feed spindle to measure the diameter by reading the raised ruler.

Shaper Spindle Micrometer Scale

A shaper micrometer scale measuring cross—feed spindle to measure the diameter by reading the…

Top and side views of mechanical drawing scales.

Scales

Top and side views of mechanical drawing scales.

The triangle scale has six surfaces for different graduations, and the scales are arranged so that the drawings may be made in any proportion to the actual size.

Triangle Scales

The triangle scale has six surfaces for different graduations, and the scales are arranged so that the…

The sector is a hinged rule with scales used for various mathematical calculations.

Sector

The sector is a hinged rule with scales used for various mathematical calculations.

An illustration of a king looking over ships.

King Looking Over Ships

An illustration of a king looking over ships.

A patch of soil and grass which has cracked after having been worked too fine in the fall.

Cracks in the soil

A patch of soil and grass which has cracked after having been worked too fine in the fall.

An adjustable T-square to create straight lines at different angles with a ruler attached to the head.

Adjustable Head T-square with Ruler

An adjustable T-square to create straight lines at different angles with a ruler attached to the head.

An adjustable T-square to create straight lines at different angles.

Adjustable Head T-square

An adjustable T-square to create straight lines at different angles.

An English T-square for drawing straight lines. The narrowing of the bottom blade makes the T-square look as if it is not perpendicular.

English T-square

An English T-square for drawing straight lines. The narrowing of the bottom blade makes the T-square…

A long fixed head T-square for drawing straight lines. The head shape of the T-square allows for drawing a long square.

Long Fixed Head T-square

A long fixed head T-square for drawing straight lines. The head shape of the T-square allows for drawing…

A regular fixed head T-square for drawing straight lines. The blade must be perfectly straight in order to draw accurate lines.

Regular Fixed Head T-square

A regular fixed head T-square for drawing straight lines. The blade must be perfectly straight in order…

"The emperor of China, Taou-Kwang, was born in 1782, and is a grandson of Kien-long. He succeeded his profligate father, Kea-king, in 1820." — Goodrich, 1844

Taou-Kwang

"The emperor of China, Taou-Kwang, was born in 1782, and is a grandson of Kien-long. He succeeded his…

A pair of timothy plants growing side by side, illustrating the difference in yield. Each one grew from a single seed.

Pair of timothies

A pair of timothy plants growing side by side, illustrating the difference in yield. Each one grew from…

An instrument for describing ellipses, often called a trammel.

Elliipsograph Tool

An instrument for describing ellipses, often called a trammel.