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By Hugh Garner Bennett

The swift improvement of utilized Chemistry lately has led to a revolution in all branches of know-how. This development has been speeded up throughout the battle, and the British Empire has now a chance of accelerating its commercial output through the applying of this data to the uncooked fabrics to be had within the assorted components of the area. the topic during this sequence of handbooks may be taken care of from the chemical instead of the engineering point of view. the economic point may also be extra favourite than that of the laboratory.

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The air can be heated by a steam coil near the inlet. In another system a centrifugal fan blows air through an arrangement of pipes which distributes it t o the drying sheds, and discharges it close t o the floor by various branch pipes. The outlets are near the roof. A system of dampers permits hot air, warm air and the used wet air to be blended in the desired proportions. I n America turret drying has been used. The sheds are vertically above one another and have latticed floors. Heated air is admitted at the bottom and rises through the goods up the building just as in a chimney.

This results in heavy freight and heavy cost per unit tannin, bulky storage, expensive handling in the factory, comparatively large bulk of spent tan, after relatively greater trouble in extracting, and the impossibility of making the strong liquors so necessary in these days to produce good weight in a short time. No satisfactory extract has yet been made from it. Pine bark, from Pinas abies, is one of the staple materials of the Continent. I t contains up to 14 per cent, of a catechol tan, and,- unlike most of this group, contains a high proportion of sugar and will give good results alone.

T< the nearly t a n n e d goods, which adsorb chiefly t h e rrxor< astringent tannins. The liquor is t h e n used for goods a / t i less advanced stage of tanning, which again take t h e m _ o s ' adsorbable constituents. s1 adsorbable substances. " I t has t h e additional advantage of being a s y s t e matic method of economically exhausting (" spending ") ± l i e tan liquors. W h e n free acid is present in the t a n l i q u o r s , it tends t o distend t h e fibres composing t h e pelt by a s t r o n g and rapid adsorption.

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