Children Holding Rulers
Illustration of children holding rulers that can be used to write mathematics story problems involving…
Shaper Clamp Micrometer Scale
A shaper micrometer scale by clamping onto the material to measure the thickness reading the rotation…
Shaper Spindle Micrometer Scale
A shaper micrometer scale measuring cross—feed spindle to measure the diameter by reading the raised…
Triangle Scales
The triangle scale has six surfaces for different graduations, and the scales are arranged so that the…
Cracks in the soil
A patch of soil and grass which has cracked after having been worked too fine in the fall.
Adjustable Head T-square with Ruler
An adjustable T-square to create straight lines at different angles with a ruler attached to the head.
English T-square
An English T-square for drawing straight lines. The narrowing of the bottom blade makes the T-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…
Regular Fixed Head T-square
A regular fixed head T-square for drawing straight lines. The blade must be perfectly straight in order…
Taou-Kwang
"The emperor of China, Taou-Kwang, was born in 1782, and is a grandson of Kien-long. He succeeded his…
Pair of timothies
A pair of timothy plants growing side by side, illustrating the difference in yield. Each one grew from…
