I have had no success searching for the acetylene gas industry that was=20 popular in this area (Mid North Carolina). Gas generators were buried and Calcium Carbide was mined in the mountains. The entire Calcium=20 Carbide industry seems to have disappeared. On 10/10/2018 9:59 PM, RussellMc wrote: > In the early 1900's there were English homes that used weights in the ton= s > range that were cranked up by household staff and used to power the new > fangle electric lighting systems. > Any patents would be well over 100 years old. > > A single energy-input-person can typically deliver ~~=3D 50 Watts essenti= ally > continually --=20 John Ferrell W8CCW Julian NC 27283 It is better to walk alone, than with a crowd going the wrong direction. --Diane Grant --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .