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An apparatus used for testing the powers of various electric batteries.

Aerial Screw

An apparatus used for testing the powers of various electric batteries.

Two galvanic cells in series.

Galvanic Cell

Two galvanic cells in series.

"Diagram of a series multiple connction. Two sets of cells are connected in series, and the two batteries thus formed, connected in parallel. The pressure equals the voltage of one cell, multiplied by the number of cells in one battery, and the amperage, that of one cell multiplied by the number of batteries." -Hawkins, 1917

Series Multiple Connection

"Diagram of a series multiple connction. Two sets of cells are connected in series, and the two batteries…

"A simple telegraph consisting of two telephone receivers, two batteries, and two keys." -Avery 1895

Simple Telegraph

"A simple telegraph consisting of two telephone receivers, two batteries, and two keys." -Avery 1895

"A complete telegraph system, displaying batteries, keys, receivers, relays and local batteries on both ends." -Avery 1895

Complete Telegraph System

"A complete telegraph system, displaying batteries, keys, receivers, relays and local batteries on both…

The Voltaic Cell is also known as the Galvanic Battery. Luigi Galvani discovered it. It is a combination of two metals in a liquid chemically acting upon one to a greater extent than the other.

Voltaic Cell

The Voltaic Cell is also known as the Galvanic Battery. Luigi Galvani discovered it. It is a combination…