id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
22784	Threlfall, Richard	On Laboratory Arts			.txt	text/plain	92587	4977	74	flint glass tubes require the most minute examination before they are made on the surface of a glass tube, and one end of the scratch be If it is desired to use the blow-pipe for working glass which is cork carrying a bit of glass tube for the same purpose to be inserted. For large blow-pipe work with lead glass I recommend a system jets are merely bits of very even three-sixteenths inch glass tubing, The air jets are simply pieces of glass tube held in position by of glass produced by drawing down a tube.] Having got a point, it The best way is to heat the glass surfaces and rub on the shellac from from the layer condensed on the glass surface of the tube to be glass-slate tool is then "roughed" just like the lens surface, but, of For very common work, bits of good plate glass are employed, and the	./cache/22784.txt	./txt/22784.txt