Cronstedt placed a bulb in the centre of his blowpipe.
The simplest and oldest form of blowpipe is a conical brass tube, about 7 in.
It is infusible before the gas blowpipe, but in the oxyhydrogen flame fuses to a clear colourless glass, which has a hardness of 5 and specific gravity 2.2.
The local guides are going to teach us how to use the blowpipe.
Cadmium salts can be recognized by the brown incrustation which is formed when they are heated on charcoal in the oxidizing flame of the blowpipe; and also by the yellow precipitate formed when sulphuretted hydrogen is passed though their acidified solutions.