[D0103AAH], Letter from Thomas Alva Edison to William Slocum Barstow, April 24th, 1901
https://edisondigital.rutgers.edu/document/D0103AAH
Transcription
W.S. Barstow 4/24/01 My Dr Barstow There must be something wrong in the data you gave me as to weight per horse power hour. The catalogue of Battery Co calculated on their longest + best cell + gives 164 lbs of total weight per horsepower hour cell weighs 8690 lbs. Their lightest automobile chloride plate gives 188 lbs per hp hour at normal discharge where is the error. You state 67 lbs at normal discharge Edison