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Cooking Thermometer: Candy Thermometer in a Glass Tube with a Venting Plastic Cap (Chaney, US 3,636,769, 1972)
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3. Novemba 2026DK
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Cooking Thermometer: Candy Thermometer in a Glass Tube with a Venting Plastic Cap (Chaney, US 3,636,769, 1972)

A candy and deep-fat thermometer that clips to the side of a pan. A glass thermometer on a printed scale card sits inside a protective glass tube, so it never touches the candy. The top of the tube is closed by a polyethylene cap that seals in normal use but softens when the whole thermometer is heated far too hot, as in an oven, so the air inside escapes instead of bursting the tube. Result: a pan-side cooking thermometer that cannot explode if overheated. Source: J. L. Chaney, US 3,636,769 (1972). Unknown: the scale range, sizes and several materials. Picture: the patent drawing.
Kati
Unknown

Maagizo

1

Mount the thermometer on its scale

Fasten a glass thermometer tube to a graduated scale card with small fasteners, the bulb at the bottom. The patent's card is marked with cooking points such as soft ball, hard ball, soft crack, hard crack, fish, fowl, potatoes and doughnuts. Fix a disk on top of the card to keep it centred in the outer tube. Not given: the range, the card and fastener materials.

Vifaa kwa hatua hii:

Kipimajoto cha maabaraKipimajoto cha maabara1 thermometer tube
Nyenzo isiyojulikanaNyenzo isiyojulikana1 scale card, disk
Metali isiyojulikanaMetali isiyojulikana1 fasteners

Zana zinazohitajika:

Vipimo visivyojulikanaVipimo visivyojulikana
2

Enclose it in the protective tube

Slide the card and thermometer into a glass protective tube, open at the top, so the bulb reaches the lower end and touches a metal cap there to pass on the heat. Not given: the tube size, the metal of the end cap, how the cap is joined to the tube.

Vifaa kwa hatua hii:

Mrija wa kiooMrija wa kioo1 protective tube
Metali isiyojulikanaMetali isiyojulikana1 end cap

Zana zinazohitajika:

Vipimo visivyojulikanaVipimo visivyojulikana
3

Fit the venting cap

Close the open top with a cup-shaped cap of a thermoplastic such as polyethylene, a friction fit that seals out dirt. Polyethylene softens at about 180 °F and melts near 250 °F: if the thermometer is heated in an oven to 400-550 °F, the air inside would reach 12-14 psi, but the cap distorts first and lets it out. Do not use rubber or a thermosetting plastic, which does not vent. Ours: LDPE.

Vifaa kwa hatua hii:

Chembechembe za LDPEChembechembe za LDPE1 cap

Zana zinazohitajika:

Vipimo visivyojulikanaVipimo visivyojulikana
4

Fit the pan clip and use it

Slide a spring clip onto the outside of the tube; its spring arm holds the thermometer upright over the edge of the pan. Clip it on with the bulb end in the candy or fat and read the scale; it also serves for deep frying. Ours: spring steel wire.

Vifaa kwa hatua hii:

Waya wa chuma cha kamaniWaya wa chuma cha kamani1 clip

Zana zinazohitajika:

Koleo lenye Ncha za DuaraKoleo lenye Ncha za Duara

Vifaa

6

Zana Zinazohitajika

2

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