Ukusebenzisana
UBUCIKO
UBUHLE NEMPILO
UBUCIKO BEZANDLA
AMASIKO NOMLANDO
EZOKUZIJABULISA
IMVELO
UKUDLA NEZIPHUZO
REVERSE ENGINEERING
IZAYENSI
EZEMIDLALO
UBUCHWEPHESHE
IZINTO EZIGQOKWAYO
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.
Ophakathi
Unknown
Imiyalelo
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.
Izinto zokwakha zalesi sinyathelo:
Insimbi engaziwa1 dial plate, sleeve, spindle, pointer, arm, stud
Okokwakha okungaziwa1 enamel and scale
Ucezu lwezinsimbi ezimbili1 curved stripAmathuluzi adingekayo:
Isethi yokusika izikulufu
Udlawu Olunezihloko Eziyindilinga
Izilinganiso ezingaziwa2
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.
Izinto zokwakha zalesi sinyathelo:
Ishidi Lensimbi Ethambile1 case and cap
Ingilazi yewashi1 windowAmathuluzi adingekayo:
Isikeli sensimbiIzilinganiso ezingaziwa3
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.
Amathuluzi adingekayo:
UhhaviniUdlawu Olunezihloko EziyindilingaIzinto
5- 1 dial plate, sleeve, spindle, pointer, arm, studIsibambeli
- 1 enamel and scaleIsibambeli
- 1 curved stripIsibambeli
- 1 case and capIsibambeli
- 1 windowIsibambeli
Amathuluzi Adingekayo
5- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
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