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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.
中级
Unknown
说明
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.
此步骤所需材料：
未知金属1 dial plate, sleeve, spindle, pointer, arm, stud
未知材料1 enamel and scale
双金属片1 curved strip所需工具：
丝锥板牙套装
圆嘴钳
未知尺寸2
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.
此步骤所需材料：
低碳钢板1 case and cap
表面皿1 window所需工具：
铁皮剪未知尺寸3
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.
所需工具：
烤箱圆嘴钳材料
5- 1 dial plate, sleeve, spindle, pointer, arm, stud占位符
- 1 enamel and scale占位符
- 1 curved strip占位符
- 1 case and cap占位符
- 1 window占位符
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