446 



New Patents and Mechanical Inventions. 



[June I, 



adds abont two ounces of sulphuric his improved apparatus consists of a 



acid diluted witli one gallon of water 

 to every pound of starch, and agitates 

 them well toj^ether as long as is neces- 

 sary, for the acid to act sufficiently on 

 the starch, and any extraneous matter 

 it may contain. He then adds a quan- 



filterer, in which the operation of fil- 

 tration is performed, and a receiver, 

 for the reception of the liquid after 

 filtration. 



In the improveil apparatus for filtra- 

 tion, the filterer is a vessel open, or 



tity of water, in about the proportion of capable of being opened at pleasure, 



fourgallonstoeverypound of starch, and Such part of the filterer as is intended 



agitates the whole well together to wash to receive the unfiltered liquid, com- 



away any extraneous matter capable of municates with the external air in such 



being removed thereby; the whole is manner, that when such part of the 



then to be left to rest a sufficient filterer as is intended to receive the 



length of time for the purified or 

 whitened starch to subside to the bot- 

 tom, from which he then draws off the 

 liquid. The washing may be repeated 

 with clean water in the manner above 

 described, as often as is found neces- 

 sary to cleanse the starch sufficiently 

 from the oxyg .ated muriate of lime 

 and sulphuric acid. The starch when 

 80 cleansed is to be boxed, dried, and 

 finished in the usual manner. The 

 object of this invention is to extract all 

 colouring matter from the wheat in the 

 manufacture of starch, which has 

 Litherto given a yellow dye to linen, 

 &c. An eff'ectual remedy for this evil 

 was never before discovered; and, as 

 the addition of blue has become a 

 general expedient to conceal rather 

 than to remove it, a perfect white has 

 never been obtained or expected by 

 ordinary means. The wliite or French 

 starch (that is, simply starch without 

 blue) is got into disuse, being of a 

 dirty yellow colour, whereas the 

 patent starch is of an almost dazzling 



filtered liquid and the receiver are ex- 

 hausted, by an air-pump or otherwise, 

 the power of atmospheric pressure on 

 the surface of the unfiltered liquid, 

 together with the pressure used in 

 ordinary filtration, may force it through 

 the filter or filters by which it is to be 

 strained. 



'J'he filter or filters are sustained in 

 the filterer by a suitable support or 

 supports, capable of bearing the above- 

 mentioned pressure, and are formed or 

 composed of substances naturally 

 adapted to the purposes of ordinary 

 filtration, or rendered fit for such pur- 

 poses by art. The filter or filters, and 

 the support or supports, are so placed 

 in the filterer, that when such part of 

 the filterer as is destined to receive the 

 unfiltered liquid is filled therewith, and 

 the part of the filterer into which the 

 filtered liquid Hows, together with the 

 receiver, are exhausted, the external 

 air is excluded, and the unfiltered 

 liquid cannot pass into such part of the 

 filterer as is destined to receive the 



whiteness, and being purified from all filtered liquid, without undergoing the 



grosser substance, is, when dissolved 

 for usual purposes, exceedingly clear 

 and beautiful, and ofsuperior strength. 

 — Repertory. 



To Henry Tritton, of Batiersfu, 

 Surrey, esq. for an improved Appara- 

 tus far Filtration. 



The principle of this invention is by 

 means of an air-pump, common pump, 

 or other mode of producing exhaustion, 

 acting on the part or j>arts of tlie ap- 

 paratus into which the filtered liquid 

 flows, to produce an exhaustion or 

 vacuum more or less perfect in such 

 part or parts, and thereby to create a 

 diflcrence between the atmosjiheric 

 pressure acting on the li(|uid before 



process of filtration, by passing through 

 the filter or filters. Such part of the 

 filterer as is destined to receive the 

 filtered liquid is made so as to bear 

 exhaustion by the air-pump, or other- 

 wise (when the filter or filters are 

 covered with liquid), and is connected 

 by a pipe or pipes, with a close re- 

 ceiver, also made so as to bear ex- 

 haustion by an air-pump, or other ap- 

 paratus for producing exhaustion, in 

 such manner that the filtered liquid 

 may flow by such pipe or pipes into the 

 receiver. 



An air-pump, or other known ma- 

 chine for producing a rarefaction or 

 exhaustion of air. is connected with 

 the receiver, or with such part of the 



and after filtration ; and, by means of filterer as receives the liquid after fil- 

 that difference of atmospheric pies- tration : an air-cock, for the admission 

 sure, more actively to force the uiifil- of air, is attached to the receiver, to ad- 

 tered liquid through the jiores, aper- niit air Mhen desirable. The receiver 

 tures, or interstices, of the filler; and has also a proper cock or cocks for th« 



discharge 



