A SIMPLE AIR BATH N. M. SHAH Karnatak College, Dharaar, India
A USEFUL air bath has been' described by A. F. Scott.' The following note describes the design and use of a simple air bath which has been successfully operated in our laboratory for the last eight years. An inverted truncated galvanized iron sheet cone about 6.5" high is inserted into a tripod as shown in the diagram. The upper and lower edges of the cone are serrated. A dish containing the solution to be evaporated is placed on the projecting upper end of the cone. A smell flame is quite sufficient for smooth evaporation without spurting. Even in quantitative experiments, excellent results have been ~ b t a i n e d . ~ This arrangement also works well for drying substances on filter paper. The paper is spread out on a
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A. F. Scorn, J. CEEM.E ~ u c . 11,419 , (July, 1934). Forvarious experimentswherein this air bath has been used, refer to Snm. N. M.. "Practical chemistrv." second edition. The students' Own Book Depot. ~harwar;India, 1933. 2
piece of asbestos board placed over the cone, and heated from beneath by a convenient flame. This arrangement can also be used for heating precipitates or substances contained in a crucible supported on an ordinary pipeclay triangle. The advantages are: (1) low cost; (2) gas economy.
It i s a pleasure to acknowledge the kind assistance given by Prof. R. L. Alimchandani in allowing this air bath to be used in our laboratories.
