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- Send-Receive Switch, 1917 -
- 1917
- Collections - Artifact
Send-Receive Switch, 1917
- Variable Condenser, 1914-1918 -
- 1914-1918
- Collections - Artifact
Variable Condenser, 1914-1918
- Marconi Audio Amplifier, Type 4-VA, 1919 - This is a Marconi Wireless model 4-VA amplifier. The device sent a weak radio signal through four amplifying tubes in succession, transforming it into a signal strong enough to be reproduced through headphones or a speaker. This was among the last products produced by American Marconi before their merger into the Radio Corporation of America (RCA).
- 1919
- Collections - Artifact
Marconi Audio Amplifier, Type 4-VA, 1919
This is a Marconi Wireless model 4-VA amplifier. The device sent a weak radio signal through four amplifying tubes in succession, transforming it into a signal strong enough to be reproduced through headphones or a speaker. This was among the last products produced by American Marconi before their merger into the Radio Corporation of America (RCA).
- Marconi Battery Charging Switchboard, circa 1915 - This device uses six light bulbs, wired in series, to step down a 110 volt input--the current from a wall socket--to an output of 6 volts--that of an "A" radio battery. Conceivably, it could also function as a "battery eliminator," which allowed a radio set designed to run on batteries to be powered from a wall socket.
- circa 1915
- Collections - Artifact
Marconi Battery Charging Switchboard, circa 1915
This device uses six light bulbs, wired in series, to step down a 110 volt input--the current from a wall socket--to an output of 6 volts--that of an "A" radio battery. Conceivably, it could also function as a "battery eliminator," which allowed a radio set designed to run on batteries to be powered from a wall socket.
- Marconi Spark Transformer, Type 96, 1917-1918 -
- 1917-1918
- Collections - Artifact
Marconi Spark Transformer, Type 96, 1917-1918
- Marconi Radio Motor Generator, 1901-1915 - In the early days of radio, a motor generator was used to convert electrical power from one form to another. These devices were typically used to convert frequency, voltage, or phase of power. By doing do, they enhanced or modified radio signals, and extended the abilities of radio equipment.
- 1901-1915
- Collections - Artifact
Marconi Radio Motor Generator, 1901-1915
In the early days of radio, a motor generator was used to convert electrical power from one form to another. These devices were typically used to convert frequency, voltage, or phase of power. By doing do, they enhanced or modified radio signals, and extended the abilities of radio equipment.
- Radio Wavemeter, circa 1915 -
- circa 1915
- Collections - Artifact
Radio Wavemeter, circa 1915
- Marconi Induction Coil, circa 1910 - An induction coil creates a high-voltage, pulsating current which arcs across a "spark gap." The spark creates electromagnetic waves, which can then be detected by a radio receiver. Induction coils were essential to the first decades of wireless and radio. Used from the late 1880s until the 1920s, spark gap powered radios were replaced as vacuum tube transmitters became available.
- circa 1910
- Collections - Artifact
Marconi Induction Coil, circa 1910
An induction coil creates a high-voltage, pulsating current which arcs across a "spark gap." The spark creates electromagnetic waves, which can then be detected by a radio receiver. Induction coils were essential to the first decades of wireless and radio. Used from the late 1880s until the 1920s, spark gap powered radios were replaced as vacuum tube transmitters became available.
- Marconi Variable Condenser, Type SE-61, 1918 -
- 1918
- Collections - Artifact
Marconi Variable Condenser, Type SE-61, 1918
- Leyden Jars and Rack, Used by the U.S. Navy, 1910 -
- 1914
- Collections - Artifact
Leyden Jars and Rack, Used by the U.S. Navy, 1910