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Plate III. Enlarged illustrations of meshes. 

 (Top left) A linen handkerchief; the holes are irregular and the strands of material are bigger than 



the holes so that filtration is poor. 

 (Top ri'iht) Bolting cloth No. 3 with 60 meshes per inch; the holes arc regular and filtration is 



good 

 (Bottom left) Stramin (open sacking); the jute fibres are coarse and flutfy so that the holes arc 



irregularly and badly choked. 

 (Bottom ri^ht) A coarse bolting cloth of 26 meshes per inch; the fibres are tightly twisted and 



woven to give rigid square clear holes. 



(Centre) Fine bolting cloth of 180 meshes to the inch. The specially woven meshes interlock to 



give a remarkably regular and clean mesh in spite ot its fineness. 



Photographs by James Fraser 



