. Journal. th a rolling motion. The vat is supplied withliquor by a centrifugal pump, from a series of tanks inwhich it is filtered and settled. The patentee also claimsthe ordinary form of tanning drum which has been in usein English and American tanneries for more than 20years.—H. R. P. Improvements in Machines for the Manufacture ofLeather. Ambrose Myall, London. Eng. Pat. 3374,February 15, 1S84. The subject of this patent is a machine identical in con-struction with the Priestman striking machine generallyused in finishing offal; the use of serrated blades forfleshing and unhairing; and th
. Journal. th a rolling motion. The vat is supplied withliquor by a centrifugal pump, from a series of tanks inwhich it is filtered and settled. The patentee also claimsthe ordinary form of tanning drum which has been in usein English and American tanneries for more than 20years.—H. R. P. Improvements in Machines for the Manufacture ofLeather. Ambrose Myall, London. Eng. Pat. 3374,February 15, 1S84. The subject of this patent is a machine identical in con-struction with the Priestman striking machine generallyused in finishing offal; the use of serrated blades forfleshing and unhairing; and the drum is to be coveredwith pumice, emery paper, or cloth, for various otheroperations, such as ruffing, whitening, and polishing -H. R. P. Improvements in Waterproofing Leather. Wm. J. Gale. Eng. Pat. 4826, March 13, leather, after washing with warm water, or withweak solution of soda or other alkali, is exposed to thefumes of ammoniacal gas, and then slowly dried in aclosed chamber.—II. R, small quantity of India-rubber solution. Whenthoroughly saturated, the leather is washed in a hath of petroleum-benzolcne. and dried on racks or otherwise. The tendencyof the leather to stretch is said to be materially lessened. —H. R. P. Improvements in the Process for Tanning TawedLeather. Caeser Kaestner, Magdeburg. Eng. ,442, August 19, leather is tanned with a solution of tannin inalcohol instead of water, by which the leather is com-pletely tanned in eight days. Tannin, catechu, andpicric acid are mentioned as suitable materials.— XIV.—AGRICULTURE, MANURES, Etc. On the Preparation of Phosphates. Dingl. Polyt. Joum. 255 [1], obtains phosphoric acid from mineral phos-phates by treating them with sulphuric aeid in leadenvessels. The gypsum formed is removed by a filter-press,ami the solution of phosphoric aeid concentrated bycausing a flame to play upon the surface of the liquid,which is placed in a leaden pan over an open lire. I
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
