A group of boys moving wooden boxes and barrels.

Boys with Boxes

A group of boys moving wooden boxes and barrels.

"A horse- or steam-power machine for digging, moving, or transporting loose gravel, sand, or soil." -Whitney, 1911

Excavator

"A horse- or steam-power machine for digging, moving, or transporting loose gravel, sand, or soil."…

Illustration showing a line that moves so that its ends constantly touch two fixed lines which are perpendicular to each other. Locus of the midpoint.

Circle Made by Ends of a Line Touching Two Fixed Lines Perpendicular to Each Other

Illustration showing a line that moves so that its ends constantly touch two fixed lines which are perpendicular…

An illustration of men in a barn moving hay with pitch forks.

Men in Barn

An illustration of men in a barn moving hay with pitch forks.

Women and children with oxen, probably leaving the town in the background. Several figures look back at town. Others are crying. Small boy is carrying a stick with a bag over his shoulder. The wagon is loaded with household possessions including a spinning wheel, and chair

People with Oxen

Women and children with oxen, probably leaving the town in the background. Several figures look back…