By Andrew John Blackford Robertson
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This is drawn out at a rate which gives a rod of 1-2 mm diameter. If no rod is available the thin glass rod can be made from tubing: thick-walled capillary tubing is the most convenient but normal 8 mm tubing will do quite well. A length of tubing, about IQ-IS cm for Blowing Holes in Glass Tubes There are basically two sites for blowing holes in glass tubing, the first where the hole is to be made in the end of a tube which has been drawn off, and the second where the hole is required in the side of a tube.
If this is done correctly the ends should be square. Cutting the tube with a file scratch leaves a line of fine bubbles in the joint due to the remains of the original scratch. This spoils the appearance of the joint when finished and may also cause a weak spot at which a pinhole may develop when testing for leaks with a Tesla coil. Jagged ends of tubing can be heated until the glass is quite soft and trimmed with scissors. The second step is to block the end of one of the tubes and heat the ends of the two tubes in the flame until the glass is quite soft and starts to collapse.
Use of the Hand Torch Generally speaking it is best to make internal seals using a bench torch and rotating the glass in the flame. If this is not practicable it is possible to work with a hand torch with the glass clamped if Method 76 Thin Glass Windows In recent years the need has arisen for very thin glass windows capable of withstanding a vacuum yet thin enough to transmit a and fJ particles. S. ROSENBLUM and R. WALEN (1945) have described the following method for putting very thin windows into capillary tubing of up to 2 mm bore.