RAIRD &TATLOCK (LONDON) LTD. 



2670 T Folded Filters. Schleicher & Schull's, 572}. 



These retain the finest precipitates and are mostly used for the filtration of greasy oils, syrups, liquors, 

 and are specially adapted to clarify unsweetened juice of raspberries and thick wine. 



2671 T Hard Folded Filters. Schleicher & Schull's, 605. 



This paper is distinguished by its especial density and hardness. Hence its useful employment. The 

 finest particles or precipitates which no other papers can filter are retained. 



2672 r Filter Paper. Schleicher & Schull's, No. 12. 



Deeply lined, suitable for rapid filtration. 

 Size, 22i by 22^ in. 



per quire, 2/- ; per ream 1 15 



2673 1 Round Filters. C. S. & S., No. 551, of Deep Black Filtering Paper. 

 D.R.P. 190145 and D.R.G.M. 314123. 



Th ; s new filter, wh : ch has been manufactured since March, 1908, will be a welcome help to the analyst for filtering light coloured 

 sed'ments and for drop reactions of the same nature. On this black paper the most minute traces of a light coloured sediment arc 

 j easily perceptible, consequently not only the complete removal of such sediment is considerably easier, but it only requires a small 

 quantity of solution. The black niters are not acted upon by water, alcohol, ether, diluted acids, or alkalies. 



2674 T Hardened (Toughened) Filters. Schleicher & Schull's, 575. 



The new thin hardened niters, No. 575, are especially adapted for use with the filter pump, as they cling closely to the sides 

 ', of the funnel. 



These hardened filters will retain the finest precipitates, and resist pressures of two or three atmospheres when wet. 

 Another important feature is durability in continued use, being available for several operations, as the precipitate can be 

 scraped off without removing the fluff from the filter. 



They are probably the only papers which are suitable for the filtration of caustic liquids, requiring a long time to deposit, 

 such as solutions of bichloride of tin (SnCl,), chloride of antimony (SbCl 3 ), also acids and strong alkalies. 



The small sizes, 4 to 7 centimetres, of these filters are particularly useful as a substitute for the expensive platinum cones. 

 , and can be used as supports or under-filters, and by so doing prevent the misfortunes attending the bursting of the large folded 

 | filter papers. 



We supply the filters, No. 575, in round discs of the following diameters and prices : 



ICHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICAL, 



521 



