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Carbon Resistance Element: Lampblack in Alkyd and Chinese Wood Oil on Laminated Phenolic
Ed

Nilikha ni

Ed

21. Oktubre 2026FI
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Carbon Resistance Element: Lampblack in Alkyd and Chinese Wood Oil on Laminated Phenolic

A carbon resistance film for radio sets. Chicago Telephone Supply's Cooper (US 2,120,930, 1938) found that lampblack bound in phenolic resin kept drifting, so he bound it in alkyd resin modified with Chinese wood oil (tung oil). Sprayed on laminated phenolic and baked up to 165 °C, the film becomes insoluble and holds its value in heat and damp. His mix gave about 50,000 ohms in an element of ordinary size, with a film about 0.003 inch thick. The picture: our diagram.
Katamtaman
1 day

Mga Tagubilin

1

Make the binder: 72 alkyd, 28 wood oil

Mix 72 parts of alkyd resin with 28 parts of Chinese wood oil (tung oil).

Mga materyales para sa hakbang na ito:

Glyptal na alkyd resinGlyptal na alkyd resin72 parts
Langis ng tungLangis ng tung28 parts

Mga kailangang kasangkapan:

Timbangang panimbangTimbangang panimbang
Basong Salamin na Pang-aghamBasong Salamin na Pang-agham
PanghaloPanghalo
Gwantes na gomaGwantes na goma
2

Mix 25 binder, 14 lampblack, 61 solvent

Thoroughly mix 25 parts of the binder with 14 parts of lampblack and 61 parts of a solvent for the binder. The patent does not name the solvent. Ours: xylene.

Mga materyales para sa hakbang na ito:

Uling ng ilawanUling ng ilawan14 parts

Mga kailangang kasangkapan:

XyleneXylene
Timbangang panimbangTimbangang panimbang
Basong Salamin na Pang-aghamBasong Salamin na Pang-agham
PanghaloPanghalo
Respirador na buong-mukhaRespirador na buong-mukha
Gwantes na gomaGwantes na goma
3

Spray onto laminated phenolic

Spray the mixture as a thin film onto a base of laminated phenolic. The patent's film is about 0.003 inch thick.

Mga materyales para sa hakbang na ito:

Composite sheet na phenolic resinComposite sheet na phenolic resin1 piraso

Mga kailangang kasangkapan:

Spray GunSpray Gun
Kompresor ng hanginKompresor ng hangin
Respirador na buong-mukhaRespirador na buong-mukha
Gwantes na gomaGwantes na goma
4

Bake: 40 °C up to 165 °C, hold 1 hour

Put it in an oven at about 40 °C, raise the heat gradually over one hour to 165 °C and hold there one more hour. Take it out and let it cool; it is ready for use.

Mga kailangang kasangkapan:

Hurnong pantuyoHurnong pantuyo
Termometro ng HurnoTermometro ng Hurno
Guwantes na Matibay sa InitGuwantes na Matibay sa Init

Mga Materyales

4

Mga Kinakailangang Kasangkapan

11

Ang blueprint na ito ay gumagawa ng

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Elementong Panlaban ng Carbon

Free

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Kaugnay na Blueprint

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CC0 Pampublikong Domain

Ang blueprint na ito ay inilabas sa ilalim ng CC0. Malaya kang kumopya, magbago, mamahagi, at gumamit nang walang pahintulot.

Suportahan ang Maker sa pamamagitan ng pagbili ng mga produkto sa kanilang Blueprint Komisyon ng Maker itinakda ng mga Vendor, o lumikha ng bagong bersyon ng Blueprint na ito at isama bilang koneksyon sa iyong Blueprint upang ibahagi ang kita.

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