A cross-section of an acorn.

Cross-section of an acorn

A cross-section of an acorn.

A cross-section view of a steam powered coach. The image reveals the boiler, the cylinders, and the mechanics of the driving wheel.

Mechanical Coach

A cross-section view of a steam powered coach. The image reveals the boiler, the cylinders, and the…

Cross-section of a kernel of corn. Food is stored in the cotyledon and in the endosperm which surrounds the embryo.

Kernel of Corn

Cross-section of a kernel of corn. Food is stored in the cotyledon and in the endosperm which surrounds…

Cross-section of New Croton dam.

Cross-section of Dam

Cross-section of New Croton dam.

Cross-section of an egg, showing the different parts.

Cross-section of an egg

Cross-section of an egg, showing the different parts.

Illustration of a frustum of a hexagonal pyramid (including cross-section).

Frustum of Hexagonal Pyramid

Illustration of a frustum of a hexagonal pyramid (including cross-section).

Cross section of a leaf, showing the breathing pores and intercellular spaces. The small dots are grains of chlorophyll.

Cross-section of a leaf

Cross section of a leaf, showing the breathing pores and intercellular spaces. The small dots are grains…

Cross section of leaf of lily, somewhat diagrammatic: e, upper epidermis,s, stomata in cross-section, p, palisade layer

Lily Leaf

Cross section of leaf of lily, somewhat diagrammatic: e, upper epidermis,s, stomata in cross-section,…

Machine screw diagram

Machine Screw

Machine screw diagram

Machine screw diagram

Machine Screw

Machine screw diagram

Machine screw diagram

Machine Screw

Machine screw diagram

Machine screw diagram

Machine Screw

Machine screw diagram

"The spinal cord and medulla oblongata. A, from the ventral, and B, from the dorsal aspect; C to H, cross-sections at different levels." —Martin, 1917

Medulla Oblongata

"The spinal cord and medulla oblongata. A, from the ventral, and B, from the dorsal aspect; C to H,…

Ideal cross-section of the laccoliths of Mt. Holmes, after restoration.

Mt. Holmes

Ideal cross-section of the laccoliths of Mt. Holmes, after restoration.

A cross-section of an oat seed.

Cross-section of oat seed

A cross-section of an oat seed.

Illustration of a frustum of a pentagonal pyramid (including cross-section).

Frustum of Pentagonal Pyramid

Illustration of a frustum of a pentagonal pyramid (including cross-section).

The Peteler locust crushing machine was a horse drawn device used to trap and kill locusts. Locusts were a serious hazard to agriculture in the 1800's; this device was one of many used in an attempt to cut back on overwhelming locust populations.

Peteler locust crushing machine

The Peteler locust crushing machine was a horse drawn device used to trap and kill locusts. Locusts…

Diagram used to prove the theorem: "Every section of a sphere by a lane is a circle."

Sphere Cut By Plane

Diagram used to prove the theorem: "Every section of a sphere by a lane is a circle."

"Cross-section of prismatic reflector, showing how light rays are refracted and dispersed." —Croft 1917

Prismatic Reflector

"Cross-section of prismatic reflector, showing how light rays are refracted and dispersed." —Croft…

Cross-section of a bean seed, showing the cotyledon, plumule, and caulicle.

Bean seed

Cross-section of a bean seed, showing the cotyledon, plumule, and caulicle.

A cross-section of a ship.

Section of a ship

A cross-section of a ship.

Cross-sections typical electric starting motor.

Starting Motor

Cross-sections typical electric starting motor.

Cross-sections typical electric starting motor.

Starting Motor

Cross-sections typical electric starting motor.

Cross section of stem of Myriophyllum, with air canals.

Cross-section Stem

Cross section of stem of Myriophyllum, with air canals.

Cross-section of stem of Ricinus communis, showing ring of secondary xylem.

Cross-section Stem

Cross-section of stem of Ricinus communis, showing ring of secondary xylem.

The Mather Kier, cross section

The Mather Kier

The Mather Kier, cross section

"<em>A</em>, enamel; <em>B</em>, pulp cavity; <em>C</em> dentine; <em>D</em>, cement." &mdash; Blaisedell, 1904

Longitudinal section of a tooth

"A, enamel; B, pulp cavity; C dentine; D, cement." — Blaisedell,…

"<em>A</em>, part of a vein laid open, with two pairs of valves; <em>B</em>, longitudinal section of a vein, showing the valves closed." &mdash; Blaisedell, 1904

Vein

"A, part of a vein laid open, with two pairs of valves; B, longitudinal section of…

Outer portion of a cross-section of a wheat grain; h, various integuments of the ovary and seed, forming the husk; a, cells of "aleurone layer" of endosperm, loaded with protein grains; b, starch-bearing cells.

Wheat Grain

Outer portion of a cross-section of a wheat grain; h, various integuments of the ovary and seed, forming…