Franklin akatanga kuongorora chiitiko chemagetsi muna 1746 paakaona dzimwe hurukuro dzaArchibald Spencer achishandisa magetsi emagetsi. Franklin akataura kuti "glass" uye "resinous" magetsi akanga asiri marudzi akasiyana e "electrical fluid" (sezvo magetsi ainzi ipapo), asi "fluid" imwe chete pasi pemitoro yakasiyana. (Ichi chikumbiro chakaitwa chakazvimiririra gore iroro naWilliam Watson.) Franklin ndiye akatanga kuvapa zita rekuti zvakanaka uye zvisina kunaka, uye ndiye akatanga kuwana nheyo yekuchengetedzwa kwemari. Muna 1748 akavaka "multiple plate capacitor", iyo yaakadana kuti "electrical battery" (isingafaniri kuvhiringidzwa neVolta's pile) nemapuranga gumi nerimwe egirazi rinotungamira rakaiswa pakati pemapuranga, rakamiswa nemakumbo esirivha uye rakabatana netambo.
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