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[[written sideways in left margin - Charge Cab $2.00 
Experiments on Diaphragms for Townsend cell 1/2 x]]
1907. April [[written over March]] 3.
I spent the morning at Westchester Hat Co. Yonkers and made an experiment so as to determine whether I could felt asbestos fibre in one of the hat machines so as to produce a cheaper diaphragm than the asbestos cloth diaphragm we are using now at Niagara Falls. The experiment was thoroughly satisfactory. In a very few seconds the whole operation was finished. I used asbestos fibre No.1 of the Johns Mandeville Asbestos Co. I intend to have the experiment repeated directly on flat cathode plates in such a way that they are placed above an opening on a flat table with suction