The Philosophical magazine; a journal of theoretical, experimental and applied physics . burner li is in the axis of the chinuiey, and terminates 15 the upper aperture. By this arrangement the flame ha>>* Sliijhtlv abridged from Liel)ius .1/;««/<-h, Sej)t. It^o!*. bv Mit(j. S. No. 123. Suppl. \\A. 18. :2 L 514 ]U. R. Bunsens Bloropipe Experhnents. the form represented in vertical section, fig. 2 : ab a correspondsto the dark part of the ordinary luminous flame, and containsthe unburned gas mixed with air. By arranging the supply ofgas so that th
The Philosophical magazine; a journal of theoretical, experimental and applied physics . burner li is in the axis of the chinuiey, and terminates 15 the upper aperture. By this arrangement the flame ha>>* Sliijhtlv abridged from Liel)ius .1/;««/<-h, Sej)t. It^o!*. bv Mit(j. S. No. 123. Suppl. \\A. 18. :2 L 514 ]U. R. Bunsens Bloropipe Experhnents. the form represented in vertical section, fig. 2 : ab a correspondsto the dark part of the ordinary luminous flame, and containsthe unburned gas mixed with air. By arranging the supply ofgas so that the point b is exactly level with the upper aperture,a flame is obtained of unvarying dimensions, which does notflicker, and may at all times be obtained, a d ab is the burningcone of the flame, and is so little luminous as to be scarcely per-ceptible. In this cone the external mantle a dac may be di-stinguished from the internal mantle a c ab, by being of a moreintense blue. The holder (fig. 3) serves to hold the test speci- Fig. .3. d. mens, which must not be larger than a millet grain, and toexpose them to the action of the flame. In the two tubes a o,which are lined with cloth, two glass rods, b b, bent at rightangles, move up and down. On the ends of the rods are twoglass tubes, c, drawn out to solid ends ; in these are fusedplatinum wires about 0-145 millim. thick, bent at their extre-mities to fine loops. To allow the glass tubes to be firmly fixed,and yet to move freely, a silk thread, provided with a knot, isintroduced, which acts like a spring. An aperture is madein the tube through which the thread passes. The temperature of the flame depends mostly on the composi-tion of the gas. This exhibits considerable discrepancy, as isseen from the following analyses of the Heidelberg gas, executedby Professor Landolt at different times :— M. R. Bunsens Blowpipe Experiments. 515 I. II. III. IV. Hydrogen . 39-30 41-01 4400 41-37 iMarsh-gas . 4056 40-71 38-40 38-30 Carbonic ox
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