Animal fats and oils, their practical production, properties, falsification and examination / by Louis Edgar Andés. Tr. from the German by Charles Salter.

  • Andés, Louis Edgar, 1848-1925.
Date:
1904
Catalogue details

Licence: In copyright

Credit: Animal fats and oils, their practical production, properties, falsification and examination / by Louis Edgar Andés. Tr. from the German by Charles Salter. Source: Wellcome Collection.

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    heated by direct fire. The pan was first filled with bones up to about 12 to 15 in. from the brim and water run in until the level of the liquid was about 8 in. below the edge, heat being then applied and continued until a fatty layer collected at the surface, this being skimmed off by flat ladles as fast as formed and collected in a wooden vat, where it was left to set. Under the fatty stratum there was always found Fig. 57. Bone-Boiling Pan with Lifting Gear and Perforated Vessel. a certain quantity of dark-coloured glue liquor, which was poured off. As soon as only a scanty amount of fat was found to be coming up to the surface of the water the opera- tion was considered at an end, the glue liquor was run off and the bones taken out of the pan, to be then dried and subsequently worked up. A slight improvement on this original practice of ob- taining fat from bones consisted in placing the latter in a tin