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Oxyhydrogen Blowpipe: Brass Tube-in-Tube, the Gases Meeting at the Nozzle (Work, 1892)

H. B. Stocks · Public domain

أنشأه

Forge

9. نوفمبر 2026

Oxyhydrogen Blowpipe: Brass Tube-in-Tube, the Gases Meeting at the Nozzle (Work, 1892)

A blowpipe that burns hydrogen in a jet of oxygen for a very hot brazing and melting flame. H. B. Stocks (Work, 1892) builds it like his cheap gas blowpipe: a fine brass tube for the oxygen, centred inside an outer brass tube (no more than 1/4 in. bore) that carries the hydrogen, joined by a three-way tube. The two gases must not mix until they reach the nozzle; each comes from its own reservoir through its own tap. Source: H. B. Stocks, "How to Prepare Cheap Blowpipes", Work, 2 July 1892, p. 250, with his reply "Oxyhydrogen Blowpipe", Work, 3 December 1892, p. 605 (Fig. 3).

متوسط

Unknown

التعليمات

Read Stocks

"The oxyhydrogen blowpipe for brazing ... is practically the same as the blowpipe shown at p. 250 ..., but the brass pipe should not be more than 1/4 in. internal diameter; the inner tube for oxygen about 1/12 in. internal diameter, and should reach to the mouth of the outer tube. It can then be filed down, if required."

Cut the tubes

Cut the brass tubes: the outer (hydrogen) tube, not more than 1/4 in. bore, threaded at one end; a curved side tube for the hydrogen supply, threaded at one end; a short straight tube for the oxygen supply, threaded at one end; and the inner oxygen tube, about 1/12 in. bore. For his gas blowpipe Stocks used 4 in., 5 1/2 in. (curved), 3 1/2 in. and 5 1/2 in.; the lengths for the brazing pipe are not given and he says the sizes may be changed. How the tube is curved is not given.

المواد لهذه الخطوة:

أنبوب نحاس أصفر4 قطع

الأدوات المطلوبة:

منشار حديد

طقم أدوات قطع اللولب

طريقة تشكيل مجهولة

أبعاد غير معروفة

Centre the oxygen tube

Cut a small strip of thin sheet brass (Stocks: full 3/4 in. by 1/2 in.), turn it into a ring and solder it on one end of the inner tube. File the ring down until it pushes into the threaded end of the short oxygen tube, and solder it inside.

المواد لهذه الخطوة:

صفيحة نحاس أصفر1 small strip

لحام قصدير-رصاص1 قطعة

الأدوات المطلوبة:

مقصّ صفائح

مبارد (مبرد يدوي)

كاوية لحام

مساعد صهر

Assemble

Screw the oxygen tube into one end of the three-way tube, screw the outer tube on the other end and see that the inner tube is exactly in its centre. Screw the curved hydrogen tube into the side branch. Fit a tap on each supply (Fig. 3; type not given).

المواد لهذه الخطوة:

وصلة أنابيب ملولبة1 three-way tube

صمام مجهول2 one per gas

Set the nozzle

The inner oxygen tube should reach to the mouth of the outer tube. Light it with hydrogen in the outer tube and oxygen in the inner, each from its own reservoir; if the flame shows a white patch, the inner tube is off centre or too long: file it down a little until correct. Never let the gases mix before the nozzle.

الأدوات المطلوبة:

مبارد (مبرد يدوي)