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- Test Tube, "Edison's Last Breath," 1931 - This test tube was one of several that Charles Edison noticed standing open in a rack in the bedroom in which his father had just died in 1931. The attending physician was asked to seal the tubes, one of which Charles later sent on to Henry Ford who kept it with other Edison mementos at his home, Fair Lane.
- 1931
- Collections - Artifact
Test Tube, "Edison's Last Breath," 1931
This test tube was one of several that Charles Edison noticed standing open in a rack in the bedroom in which his father had just died in 1931. The attending physician was asked to seal the tubes, one of which Charles later sent on to Henry Ford who kept it with other Edison mementos at his home, Fair Lane.
- Electrical Discharge Tube -
- Collections - Artifact
Electrical Discharge Tube
- Eimac Klystron Vacuum Tube, circa 1958 - The klystrom is a vacuum tube that amplifies high-range radio frequencies; it is an essential factor in the history of radar, microwave, and telecommunications. Klystroms also power UHF television, particle accelerators, and radiation therapy equipment. In 1937, brothers Russell and Sigurd Varian invented the klystrom, and founded Varian Associates -- one of the first technology companies in Silicon Valley.
- circa 1958
- Collections - Artifact
Eimac Klystron Vacuum Tube, circa 1958
The klystrom is a vacuum tube that amplifies high-range radio frequencies; it is an essential factor in the history of radar, microwave, and telecommunications. Klystroms also power UHF television, particle accelerators, and radiation therapy equipment. In 1937, brothers Russell and Sigurd Varian invented the klystrom, and founded Varian Associates -- one of the first technology companies in Silicon Valley.
- Vacuum Tube, Reference Number 2553, 1946 - George Devol was a problem solver and prolific inventor, particularly in the area of automation. Around 1940, Devol developed the "Sun Switch," a photoelectric switch, to regulate light levels. Lighting for streets, factories and other public, private and business areas could be turned on and off reliably and efficiently with this device. This technical drawing defined the design requirements for one of its components.
- July 05, 1946
- Collections - Artifact
Vacuum Tube, Reference Number 2553, 1946
George Devol was a problem solver and prolific inventor, particularly in the area of automation. Around 1940, Devol developed the "Sun Switch," a photoelectric switch, to regulate light levels. Lighting for streets, factories and other public, private and business areas could be turned on and off reliably and efficiently with this device. This technical drawing defined the design requirements for one of its components.
- Fire Insurance Map of the American Paper Tube Co., Woonsocket, Rhode Island, Surveyed December 7, 1929 - Fire insurance maps provided information to insurance companies about potential risks to homes, businesses, and factories. These maps -- with their easily identifiable symbols and color-coding -- depicted structural features, types of construction, and locations of fire hazards. Armed with this information, insurance underwriters could propose reasonable rates and offer protection against possible catastrophic financial loss in the event of a fire.
- December 07, 1929
- Collections - Artifact
Fire Insurance Map of the American Paper Tube Co., Woonsocket, Rhode Island, Surveyed December 7, 1929
Fire insurance maps provided information to insurance companies about potential risks to homes, businesses, and factories. These maps -- with their easily identifiable symbols and color-coding -- depicted structural features, types of construction, and locations of fire hazards. Armed with this information, insurance underwriters could propose reasonable rates and offer protection against possible catastrophic financial loss in the event of a fire.
- Deforest Vacuum Tube, 1920 - Vacuum tubes appear in older radios, televisions, amplifiers, computers, and other electronic devices. Their function: to amplify and strengthen weak electronic signals. Typical tubes are sealed glass bulbs evacuated of gas, allowing electron flow to be influenced by an interior cathode, plate and grid. Perfected in 1906 by Lee De Forest, the vacuum tube was the genesis of a communications revolution.
- 1920
- Collections - Artifact
Deforest Vacuum Tube, 1920
Vacuum tubes appear in older radios, televisions, amplifiers, computers, and other electronic devices. Their function: to amplify and strengthen weak electronic signals. Typical tubes are sealed glass bulbs evacuated of gas, allowing electron flow to be influenced by an interior cathode, plate and grid. Perfected in 1906 by Lee De Forest, the vacuum tube was the genesis of a communications revolution.
- Eimac Diode Vacuum Tube, 1946-1949 - Vacuum tubes appear in older radios, televisions, amplifiers, computers, and other electronic devices. Their function: to amplify and strengthen weak electronic signals. Typical tubes are sealed glass bulbs evacuated of gas, allowing electron flow to be influenced by an interior cathode, plate and grid. Perfected in 1906 by Lee De Forest, the vacuum tube was the genesis of a communications revolution.
- 1946-1949
- Collections - Artifact
Eimac Diode Vacuum Tube, 1946-1949
Vacuum tubes appear in older radios, televisions, amplifiers, computers, and other electronic devices. Their function: to amplify and strengthen weak electronic signals. Typical tubes are sealed glass bulbs evacuated of gas, allowing electron flow to be influenced by an interior cathode, plate and grid. Perfected in 1906 by Lee De Forest, the vacuum tube was the genesis of a communications revolution.
- Van Dyke VX40 Radio Tube -
- Collections - Artifact
Van Dyke VX40 Radio Tube
- Beck's Regulator Vacuum Tube -
- Collections - Artifact
Beck's Regulator Vacuum Tube
- RCA Radiotron Vacuum Tube, Model WD-11, 1923-1924 - Vacuum tubes appear in older radios, televisions, amplifiers, computers, and other electronic devices. Their function: to amplify and strengthen weak electronic signals. Typical tubes are sealed glass bulbs evacuated of gas, allowing electron flow to be influenced by an interior cathode, plate and grid. Perfected in 1906 by Lee De Forest, the vacuum tube was the genesis of a communications revolution.
- 1922-1924
- Collections - Artifact
RCA Radiotron Vacuum Tube, Model WD-11, 1923-1924
Vacuum tubes appear in older radios, televisions, amplifiers, computers, and other electronic devices. Their function: to amplify and strengthen weak electronic signals. Typical tubes are sealed glass bulbs evacuated of gas, allowing electron flow to be influenced by an interior cathode, plate and grid. Perfected in 1906 by Lee De Forest, the vacuum tube was the genesis of a communications revolution.