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Oven Thermometer: Door-Mounted Dial with a Curved Bimetal Strip (Whittier, US 1,498,413, 1924)
A dial thermometer that fits in an oven door or wall. Behind an enamelled dial plate, a curved bimetal strip runs from a fixed stud to a little arm on a spindle; as the oven heats, the strip bends, turns the spindle and swings the pointer across the scale on the front. Everything is mounted on the dial plate as one unit and dropped into a shallow stamped case with a glass cap.
Result: a compact oven thermometer, easy to calibrate and adjust.
Source: H. R. Whittier, US 1,498,413 (1924). Unknown: metals, sizes and the scale unit. Picture: the patent drawing.
Katamtaman
Unknown
Mga Tagubilin
1
1
Make the dial unit
Make the dial unit
Cut a metal disk for the dial plate, enamel its front and mark the scale (the patent's drawing reads 200 to 500). Thread a sleeve through the plate near one edge and pass a spindle loosely through it, with a pointer fixed on its front end and a short arm on its back end. Set a stud through the plate: in front it stops the pointer, behind it anchors one end of a curved bimetal strip whose other end is pinned to the arm. Not given: metals, sizes, the scale unit.
Mga materyales para sa hakbang na ito:
Hindi alam na metal1 dial plate, sleeve, spindle, pointer, arm, stud
Hindi kilalang materyal1 enamel and scale
Piraso ng dalawang metal1 curved stripMga kailangang kasangkapan:
Set sa paggawa ng sinulid ng turnilyo
Plais na bilog ang dulo
Hindi alam na sukat2
2
Make the case
Make the case
Stamp a shallow case from thin sheet metal, closed at the back, with perforated ears for fixing it in the oven door or wall, and press lugs in from its wall for the dial plate to sit on. Make a cap with a glass to close the open front. Ours: steel sheet and a watch glass.
Mga materyales para sa hakbang na ito:
Plantsang Malambot na Asero1 case and cap
Salaming pang-orasan1 windowMga kailangang kasangkapan:
Gunting na pangyeroHindi alam na sukat3
3
Assemble, calibrate and fit
Assemble, calibrate and fit
Calibrate the strip and set the pointer while the unit is out of the case, then drop the dial unit onto the lugs and fit the cap, which holds the plate in place. Fasten the case through its ears in the oven door or wall. As the oven heats, the strip bends and the pointer swings across the scale. Not given: how it is calibrated.
Mga kailangang kasangkapan:
HurnoPlais na bilog ang duloMga Materyales
5- 1 dial plate, sleeve, spindle, pointer, arm, studPlaceholder
- 1 enamel and scalePlaceholder
- 1 curved stripPlaceholder
- 1 case and capPlaceholder
- 1 windowPlaceholder
Mga Kinakailangang Kasangkapan
5- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
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