CT 



BAIRD &TATLOCK. (LONDON) LTD. 





2685-2688 



Pyramid Laboratory Filter Presses. 



GENERAL DESCRIPTION. 



The " Pyramid " Filter Press derives its name from the studded or bossed drainage surface of the filter plates which suppor 

 the cloths. This is found in practice to be much more efficient than a surface formed of fine ribs, for they allow a sufficient suppor 

 to the cloths under pressure, and also a free passage for the filtrate and wash water. This gives the largest practical area of th 

 filter cloth with a condition of maximum efficiency, filtering from 15 to 35 per cent, more rapidly than the older forms of drainag 

 surface ; also this form of drainage surface is superior to a surface of perforated wrought iron or steel plates, which rapidly corrode 

 forming a couple with cast iron. Another advantage is that the " Pyramid " drainage surface is much more easily cleaned. 



FLUSH PLATE AND DISTANCE FRAME TYPE. 



The distinctive feature of the construction of the cells in this type, which are made up of solid slabs, is that the rims < 

 flush with the pyramid-studded face for drainage at the back of the filter cloths to take away the filtrate, not recessed, the dept 

 of the chambers being made up by a separate distance frame, which fixes the depth of the filter cell and thickness of the filter cak 

 formed. They are constructed as non-washing and perfect washing machines. They make the best form of washing filter press, 

 giving the most concentrated washings. The feed and washing passages are formed in the margins of the plates and frames so that 

 no cloth clips are necessary, all joints on the chamber passages and cloths being made secure by tightening up the main screw < 

 the machine. 



. FLUSH PLATE AND DISTANCE FRAME TYPE, PATENT PYRAMID DRAINAGE SURFACES 



ON THE PLATES. 



The abcne prices are exclusive of buckets and nitrate dish. (Prices continued on page 525.) 



-CROSS STREET HATTOTST GARDEN, E-C 



