Instructions for the chemical analysis of organic bodies / by Justus Liebig ; translated from the German, by William Gregory.

  • Justus von Liebig
Date:
1839
Catalogue details

Licence: Public Domain Mark

Credit: Instructions for the chemical analysis of organic bodies / by Justus Liebig ; translated from the German, by William Gregory. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    14/66 (page 10)
    shape of No. .3. About an inch of a tube, «, equal to a, is now sol- dered to a narrow barometer tube similar to h h; one end of « is drawn out to a point, which is cut off near to d, and soldered to one of the points b—which is previously reduced to 2 inches (No. 5). a, is now to be blown out to a bulb, (No. 6.) The same is done at the opposite end of /3 /3, 12. h . a h h h h b IS. One of the bulbs « » may be rather smaller than the other; one how- ever must be so large as to hold more liquid than the middle bulb of a. The tubes are now heated by a spirit-lamp close to the bulbs, /3 /3, and are bent at an angle of 45° (Jiff-13.) Above the bulbs, m and n, these two tubes are again bent. Here it is to be observed, that the tube o, having the larger bulb m, should be so bent that its horizontal portion, con- nected with the tube containing chloride of calcium, is to the left of the operator. The tubes o andjo, after being sufficiently heated at are bent so as to cross each other, as shown at B. By attending closely to the figure, we may be certain of giving to the apparatus the best form and proportions. The sharp ends of the tubes o and p must be rounded in the flame of the spirit- lamp. [The Apparatus thus prepared has the exact form and size represented by Jrff. 14, page 11.—W. G.] To fill this apparatus with caustic ley, one end must be connected by a cork with the sucker, 15; the other end of the potash apparatus is then dipped into a glass containing the ley, and the liquid drawn by suction with the mouth into the apparatus. The end of the tube which has been moist- ened with the ley is to be dried externally, and internally: the latter is easily accomphshed by means of a small roll of filtering paper. The apparatus, when quite dry and clean, is weighed, and then joined to the tube with the chloride of calcium by means of a small tube of caoutchouc. The potash apparatus, when filled with ley, commonly weighs