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For the term "experimental homemade transistor from carbon sand".

Martin Tajmar on Experimental Gravitomagnetic Research

Dr. Martin Tajmar details the experimental parameters involved with gravitomagnetic research in superconductors. Tajmar describes the rotating superconductor laboratory apparatus, accelerometer setup, and potential sources of error involved with the remarkable measurements of a…

Homemade rechargeable battery—dissected after load testing

This shows my homemade rechargeable “solder battery” dissected after being load tested for several days. The cell still functions perfectly but a dark redish brown oxide deposit did fall off the positive electrode after…

Lead–Alum Homemade Rechargeable Battery

This shows a couple of very simple homemade rechargeable batteries that use lead electrodes with an Alum (aluminum sulfate hydrate) & distilled water electrolyte. John Bedini has been successfully converting full size lead acid…