SENI
KECANTIKAN & KESEJAHTERAAN
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KEJURUTERAAN TERBALIK
SAINS
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TEKNOLOGI
BOLEH PAKAI
Electric Soldering Iron: Miner, 1890
Earlier electric soldering irons heated a hollow copper head from inside, through finely divided carbon pressed against the tip, so the whole outside of the head lost heat to the air. Willard M. Miner of Plainfield, New Jersey, patented the alternative in 1890, US 421,185: keep the copper head solid, which holds its heat longer, and wind the heating resistance round the outside of it, under a shell that concentrates the heat on the copper and stops it escaping. The coil is German silver wire, wound round a reduced part of the head without touching it, with one end connected to the head and the other to the supply.
Pertengahan
Workshop process
Arahan
1
1
Turn the head
Turn the head
Turn a solid copper head with its point. A little back from the point, cut the head down to a smaller diameter for some distance, leaving a shoulder, and thread a shank at its rear end.
Bahan untuk langkah ini:
Bar bulat tembaga1 kepingAlatan diperlukan:
Mesin Pelarik Logam2
2
Wind the coil
Wind the coil
Coil German silver wire round the reduced part of the head, the coil slightly larger than the head so the two do not touch. Connect one end of the coil to the head at the shoulder; the other end goes to the supply.
Bahan untuk langkah ini:
Dawai rintangan perak Jerman1 as requiredAlatan diperlukan:
Playar Gabungan3
3
Shell
Shell
Slip on the shell, of brass lined with non-conducting material. Close its inner end with an insulating disc held by a washer and nut on the threaded shank.
Bahan untuk langkah ini:
Kelongsong loyang berlapik1 keping
Cakera hujung penebat1 kepingAlatan diperlukan:
Sepana boleh laras4
4
Handle
Handle
Screw the shank into the metal socket in the handle, which takes the second connection.
Bahan untuk langkah ini:
Batang Kayu Keras untuk Hulu1 kepingBahan
5- 1 kepingPemegang Tempat
- 1 as requiredPemegang Tempat
- 1 kepingPemegang Tempat
- 1 kepingPemegang Tempat
- 1 kepingPemegang Tempat
Alatan Diperlukan
3- Pemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
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