Aluminum air battery I probably included in a recent prior post,
papercrete or large quantity papier mache mixer,plans-list.
http://www.exo.net/~pauld/activities/AlAirBattery/alairbattery.html
(aluminum air battery---unique in that it actually produces a useful
amount of current, sufficient to run small electric motor. It requires
some activated charcoal, another reason for you producing it as a highly
profitable home business.)
http://starship-enterprises.net/Papercrete/Mixer/ (a
pull-behind-your-car-or-pickup truck papercrete mixer---uses a lawnmower
blade in a tub to do the mixing---might try this for mixing alternate
hypertufa fibers if peat moss is not available or too expensive---as
mentioned before, alternate grass, corn leaves, hydrilla, duckweed et.
al. would first have to be shredded to proper length in a screened
hammer-mill like an old WW.Grinder, Kemp, or newer McKissic---and be
dried before shredding.)
http://metalwebnews.com/poorman/energy-money.html (list of plans for
simple equipment, cement mixers, how to get emergency gasoline out of a
closed gas station pump, backyard pottery equipment, candle-powered
radio, hydraulic ram pump, swivel hoist for your pickup truck,
windpowered clothes-washing machine)