[X219-F] Charles Teeple Collection, Jeffersonville, Ind.
This note from Edison to laboratory employee David K. Hickman is undated, but an inscription on the document indicates that it may be from December 1888. Hickman, who worked for Edison from 1880 until 1892, conducted experiments on carbonizing bamboo filaments in order to extend their life. The note describes a series of filament experiments conducted by Edison and provides suggestions for improving the carbonizing process.
