BAIRD &.TATLOCK (LONDON) LTD. 



267V 



2681-2682 



2683 



2684 



679 T Filter Cones, Schleicher & Schull's, 574, made of hardened paper No. 575. 



It is a well-known fact that funnels of perfect form and correct angle to fit the niters faultlessly are most difficult to produce. 

 i filtering witli the aspirator or pump, air channels are formed between the irregular sides of the funnel and the paper, rendering 

 ic suction almost useless. 



By means of our new semi-circular filter cone these difficulties are overcome. 



The paper is folded as shown in sketch (the overlapping part is outside). The cone so formed is placed in the funnel under 

 ic point of the regular filters. On aspiratine, the cone will form a tight seal (much more perfect than the platinum cone between 

 ic filter paper and the wall of the funnel), preventing passing of air or precipitates poured over the edge of the filter. 



Chemists will readily recognise the real practical convenience of these cones. Being made of the hardened paper No. 575, 

 icy will stand without further protection the pressure of the atmosphere caused by use of the pump. 



These semi-circular discs for filter cones are furnished in the following sizes : 



680 1 Filter Hats, Schleicher & Schull's, 577. 



The hats are made in one piece seamless, and fit exactly into a funnel of 60 degrees. They are eminently 

 lapted for filtering greasy and ethereal oils, spirits, salt solutions, etc. 



Length in centimetres . . 6 8 10 12 14 16 20 25 



Price per 100 .. ..5/3 6/1 6/4 8/6 9/10 11/7 15/5 18/8 



581 T Rumpler's Filtering Cups, No. 552, manufactured by Messrs. Carl Schleicher & Schull, for 

 use with Gooch's Crucible . . . . . . Price per box of twenty-five cups 



i82 T Gooch's Crucibles, of Royal Berlin Porcelain, 67 mm. high by 32 mm. diam. at top, for 

 use with above . . . . . . . . . . each, 2/- ; per doz. 



)83 T Filtering Apparatus, Witt's, with lid and funnel ground to fit, for rapid filtration by 

 means of water pump. 



Height of glass cylinder . . . . n 14 16 cm. 



Inside diameter of cylinder . . . . 7 9 n cm. 



Diameter of funnel . . . . 4 5 6 cm. 



Price . . . . . . . . 8/- 9/- 10/- each. 



080 



130 



)84 T Filter Flask, with stopcock on side tube. 

 Capacity 

 Price 



2 litres. 

 5/- each. 



523 



