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"Battery and lamp set for illuminating partition interiors." —Croft 1915

Battery and Lamp

"Battery and lamp set for illuminating partition interiors." —Croft 1915

"A, B, C, tunnelings of the carpenter bee; E, the carpenter bee; D, a partition; F, teeth, magnified" — Goodrich, 1859

Carpenter Bee

"A, B, C, tunnelings of the carpenter bee; E, the carpenter bee; D, a partition; F, teeth, magnified"…

"Diagram to show thickening dome on both sides of the partition wall." — Encyclopedia Britanica, 1893

Thickening Dome

"Diagram to show thickening dome on both sides of the partition wall." — Encyclopedia Britanica,…

"Suppose the mirror, a b, to be placed on the side of a room, and a lamp to be set in antoher room, but so situated as that its light would shine upon the glass. The lamp itself could not be seen by the eye placed at e, because the partition d is between them; but its image would be visible at e, beacuse the angle of the incident ray, coming from the light, and that of the reflected ray which reaches the eye, are equal." -Comstock 1850

Plane Mirror

"Suppose the mirror, a b, to be placed on the side of a room, and a lamp to be set in antoher room,…

Examining a partition interior.

Partition

Examining a partition interior.

"Splitting of partition wall between guard-cells to form the stoma (Sachs.)" — Encyclopedia Britanica, 1893

Sachs

"Splitting of partition wall between guard-cells to form the stoma (Sachs.)" — Encyclopedia Britanica,…