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"Side view of built up armature core. The sheet metal ring sections containing the teeth are fastened into dovetail notches in the spider as shown." — Hawkins, 1917

Armature core

"Side view of built up armature core. The sheet metal ring sections containing the teeth are fastened…

"Entosternum of one of the mygalomorphous spiders; ventral surface. Ph.N., pharyngeal notch. The posterior median process with its repetition of triangular segments closely resembles the same process in Limulus." — The Encyclopedia Britannica, 1910

Entosternum

"Entosternum of one of the mygalomorphous spiders; ventral surface. Ph.N., pharyngeal notch. The posterior…

"Dorsal surface of an entosternum. Ph.N., pharyngeal notch." — The Encyclopedia Britannica, 1910

Entosternum

"Dorsal surface of an entosternum. Ph.N., pharyngeal notch." — The Encyclopedia Britannica, 1910

An illustration of notching.

Notching

An illustration of notching.

A wheel having recesses into which cogs or another wheel may be inserted, or into which cogs may be driven.

Core Wheel

A wheel having recesses into which cogs or another wheel may be inserted, or into which cogs may be…