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Art. LXI.—On an Improved Adjustable Drip-proof Bunsen Burner.
[Read before the Philosophical Institute of Canterbury, 1st September, 1897.]
There are so many modifications of the ordinary vertical Bunsen that some apology is needed for adding yet one more to their ranks. The writer has been compelled by a recent publication of Dr. Hugh Marshall* to publish an account of the modification at which he has been working, although it is still in the experimental stage. The main idea of the burner is a side gas combined with a central air supply, each being made as axially symmetrical as possible.
The base of the burner consists of two turned metal cones, which screw one over the other, allowing the gas to enter through the annular opening between them. Over these cones is situated the ordinary mixing-tube. The bore of this tube is also carried downwards completely through the inner cone. The gas-supply may be
[Footnote] * Journal Soc. Chem. Ind., 1897, 16, 395.
![Thumbnail: [Volume 30, 1897 page 498]](/journals/rsnz/images/rsnz_30/thumbnails/rsnz_30_00_0523_0498_ac_02.gif)
readily and accurately adjusted by means of the screw-thread of the cones. In the smaller sizes, as while the gas-supply varies with the diameter the air-supply practically varies as the square of the diameter, the ordinary side-holes may also be used to gain an increased supply of air. Details of construction are evident from the accompanying figure.
If the gas-supply is constant, the burner can be easily and economically constructed out of sheet brass, naturally without any screw-thread on the cones.
The modification would seem specially adapted for high-power Bunsens, the short mixing-tube necessary proving here a great advantage. Instead of drip-proof it may truthfully be described as shower-proof, even a beaker full of water having but little effect on it.