By Hugh Garner Bennett
The fast improvement of utilized Chemistry in recent times has caused a revolution in all branches of expertise. This development has been sped up throughout the conflict, and the British Empire has now a chance of accelerating its commercial output through the applying of this data to the uncooked fabrics on hand within the assorted elements of the realm. the topic during this sequence of handbooks may be taken care of from the chemical instead of the engineering perspective. the economic element can also be extra favorite than that of the laboratory.
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I n these varieties is usually compensated by corresponding differences in price. The quality of myrabolans cannot b e safely judged by appearance. Much bloom is deposited b y myrabolans liquors, especially by " J ' s . " Myrabolans are amongst t h e most sugary of tanning materials, containing u p t o 5 J per cent. I t is therefore one of the best materials for giving a plump leather. Broadly speaking, those varieties which yield most sugar yield least bloom, and vice versa. Myrabolans tannin has a small affinity for hide substance and penetrates t h e hide very slowly.
When partly dry, it is cut u p into i j - i n . cubes and dried further on cocoanut matting. The rough " cubes " as imported contain 40-50 per cent, of tannin. Myrabolans Extract is now largely manufactured in this country. A liquid extract of 25, 30 or even 35 per cent, strength is made for home consumption, a n d a solid extract far export. The light colour, high strength and easy extraction of t h e natural material h a v e all facilitated t h e task of t h e manufacturer. The material is extracted in open vats or stills of copper, which t a k e one ton or more of nuts.
Pp. 129 and 174). —In the tanyard the liquors are almost invariably divided up into sections, called " rounds " or " sets/' in which the mechanical operations are different in aim and method. In the first pits entered by the goods there is rapid adsorption in spite of the low concentration and small astringency, and the great aim is to obtain evenness of VEGETABLE TANNAGE 47 action and a good level colour. I t is also necessary to maintain the rate of adsorption. All t h e aims are attained by frequently moving the goods.
animal proteins by Hugh Garner Bennett