. Annual report on essential oils, synthetic perfumes, &c. Essences and essential oils; Perfumes. 54 Report of Schimmel § Co. 1921 We now fill the lamp with the benzaldehyde to be tested, close it by the burner from which the asbestos wick will project by about 2 mm., put on the cap B and weigh. Having taken the cap off again the threaded sleeve and globe-spider are pushed over the glass tube, the globe is put on and its height is so adjusted by turning the spider, that the opening of the globe extends only a little higher than the end of the asbestos wick. The lamp is now mounted in its h
. Annual report on essential oils, synthetic perfumes, &c. Essences and essential oils; Perfumes. 54 Report of Schimmel § Co. 1921 We now fill the lamp with the benzaldehyde to be tested, close it by the burner from which the asbestos wick will project by about 2 mm., put on the cap B and weigh. Having taken the cap off again the threaded sleeve and globe-spider are pushed over the glass tube, the globe is put on and its height is so adjusted by turning the spider, that the opening of the globe extends only a little higher than the end of the asbestos wick. The lamp is now mounted in its holder, in which it will rest on the three lower large inward projections, whilst the three upper and smaller projections keep an even annular distance between the lamp and the wall. The benzaldehyde is lighted, and the vessel and lamp are at once brought under the cylinder D. The height of the 10 20 30 40 cm, i—I—i. <-<« ^-\ B flame is adjusted to 6 or 7 mm., if necessary by turning the globe spider, and attention is paid to the non-appearance of any soot. With this size of flame about l g. of benzaldehyde will be consumed per hour. The stopper C is then tightly pushed into the cylinder _D, and the connection with the wash bottle is re-established for maintaining the circulation of the air, if this connection should have been interrupted. By means of a screw pinch cock pushed over the rubber tube the air supply is regulated; it has been proved to be advantageous to let the water-jet pump draw briskly, lest the flame be extinguished with insufficient draught. The air feed will be sufficient when no water is deposited on the wall of the combustion cylinder. Should the absorbing liquids begin to foam strongly, a few drops of petroleum are put in to the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the origin
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