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NOTE ON A NEW METHOD OF CONSTRUCTING 

 SMALL GLASS TANKS. 



By T. G. Kingsford. 

 (Bead March IStk, 1904.) 



Those who have had occasion to use any of the various kinds of 

 cemented glass tanks or troughs usually sold for microscopical 

 and other purposes, have, I think, generally found them far from 

 satisfactory. They are difficult to clean, and, especially in the 

 commoner forms, very often develop leaks. I have also found 

 that when placed close to a lamp they will occasionally crack. 



The form of tank to which I wish to draw your attention has, 

 in my hands at least, proved itself entirely free from the above 

 defects. I therefore feel much pleasure in introducing it, hoping 

 that others may find it as satisfactory as I have done. 



Its construction is extremely simple, and within the range 

 •of any amateur mechanic. It consists essentially of two glass 

 •discs forming the sides of the tank, a band of thin sheet metal 

 (Figs. 1 and 2, a), lined with rubber (b), forming the edge of 

 the tank, and a metal clip or small bolt (c) to draw the ends of 

 the band toward each other at the top of the tank, the band 

 being of such a length as to not quite meet at the top, thereby 

 leaving an opening for the introduction of liquid, etc. Short 



