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Carbon Resistance Ring: Laminated Paper Gelled with 10% Tung Oil, Graphite-Shellac Track
Mallory's quiet volume-control ring (US 2,144,925, 1939). Hard bases were noisy and soft paper ones changed with damp. Their answer: paper rings soaked in 10 % raw tung oil and baked, so the oil gels inside the paper. It shuts out moisture but stays soft and springy, and the wiper runs on it quietly. A graphite paint makes the track, silver paint the ends.
The picture: the patent's drawing (Fig. 3).
中级
1 day
说明
1
1
Punch rings from three-ply paper
Punch rings from three-ply paper
The base is three papers stuck into one sheet: litho paper at the back, newsprint in the middle, manila on the face that takes the track. Punch rings from it. Ours: a punch press with a ring die.
此步骤所需材料：
三层层压纸1 个所需工具：
冲床
圆环冲裁模
橡胶手套2
2
Soak 1 hour in 10 % tung oil in naphtha
Soak 1 hour in 10 % tung oil in naphtha
Soak the rings for about one hour in about 10 % raw tung oil in naphtha. Use raw oil, not heat-bodied or treated oil, so it can still gel.
此步骤所需材料：
桐油10 parts所需工具：
石脑油
玻璃烧杯
等臂天平
搅拌器
全面罩呼吸器橡胶手套3
3
Air-dry, then bake at 210–250 °C
Air-dry, then bake at 210–250 °C
Dry the rings in air for two hours or more, then bake 15 to 30 minutes at 210 to 250 °C. The oil gels in the paper's pores; the paper stays pliable.
所需工具：
干燥炉
烤箱温度计
耐热手套4
4
Spray the graphite track
Spray the graphite track
Spray on the resistance paint, for example graphite in a shellac binder. The patent gives no proportions. The track can be tapered in thickness, width or mix to shape the resistance curve.
此步骤所需材料：
石墨粉1 as required
虫胶漆1 as required所需工具：
喷枪
空气压缩机全面罩呼吸器橡胶手套5
5
Paint silver ends, bake at 220 °C
Paint silver ends, bake at 220 °C
Spray or paint the two end terminals with silver particles in shellac. Dry, then bake at about 220 °C to cure and harden the track. The slight warp from soaking flattens out again.
此步骤所需材料：
银导电漆1 as required所需工具：
喷枪干燥炉烤箱温度计耐热手套此蓝图制作
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