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Story
July 5, 1928
The Gordon Journal
Gordon, Sheridan County, Nebraska
What is this article about?
Description of a high-frequency electric furnace that selectively heats conductors, safely containing heat for experiments with hands and mice, and its application in manufacturing wireless valves by removing gas bubbles.
Clipping
OCR Quality
98%
Excellent
Full Text
Electric Furnace One of Scientific Freaks
When men can thrust their bare hands into an electric furnace that melts metal with ease, it would seem that there is such a thing as cold heat.
White mice, too, will run about in this furnace without suffering any ill-effects, while an interior of a wireless valve can be heated to incandescence without heating the glass bulb itself.
The secret is that the furnace heats only electrical conductors, being a high-frequency inductance furnace.
It is in the manufacture of wireless valves that one of the most interesting uses of this furnace is found. Just before the valve is sealed from the vacuum pump it is placed for a moment within a high-frequency coil.
The metal parts immediately become red hot and the "bubbles" of gas and vapor are boiled out. The valve is then sealed from the pump with the knowledge that the later heating of the valve by the filament will not cause further release of bubbles.
When men can thrust their bare hands into an electric furnace that melts metal with ease, it would seem that there is such a thing as cold heat.
White mice, too, will run about in this furnace without suffering any ill-effects, while an interior of a wireless valve can be heated to incandescence without heating the glass bulb itself.
The secret is that the furnace heats only electrical conductors, being a high-frequency inductance furnace.
It is in the manufacture of wireless valves that one of the most interesting uses of this furnace is found. Just before the valve is sealed from the vacuum pump it is placed for a moment within a high-frequency coil.
The metal parts immediately become red hot and the "bubbles" of gas and vapor are boiled out. The valve is then sealed from the pump with the knowledge that the later heating of the valve by the filament will not cause further release of bubbles.
What sub-type of article is it?
Curiosity
Extraordinary Event
What keywords are associated?
Electric Furnace
High Frequency Inductance
Wireless Valves
Cold Heat
Scientific Freak
Story Details
Story Details
An electric furnace heats only electrical conductors using high-frequency inductance, allowing bare hands and white mice to enter without harm and heating wireless valve interiors without affecting the glass, used to boil out gas bubbles before sealing.