Experiments and observations on electricity : made at Philadelphia in America . LETTER I FROM Mr Benj. Franklin^ in Philadelphia. T o Mr Peter CoLLiNsoN, S. London. SIR, July 28, 1747. HE neceffary trouble of copying longletters, which perhaps when they cometo your hands may contain nothingnew, or worth your reading (To quickis the progrefs made with you in E-leftricity) half difcourages me fromwriting any more on that fubjed:. Yet I cannot forbearadding a few obfervations on M. Mufche?ibroek!s won-derful B The 2 Mr B, F R A N K L I N s 1. The non-eledtric containd in the bottle
Experiments and observations on electricity : made at Philadelphia in America . LETTER I FROM Mr Benj. Franklin^ in Philadelphia. T o Mr Peter CoLLiNsoN, S. London. SIR, July 28, 1747. HE neceffary trouble of copying longletters, which perhaps when they cometo your hands may contain nothingnew, or worth your reading (To quickis the progrefs made with you in E-leftricity) half difcourages me fromwriting any more on that fubjed:. Yet I cannot forbearadding a few obfervations on M. Mufche?ibroek!s won-derful B The 2 Mr B, F R A N K L I N s 1. The non-eledtric containd in the bottle differs wheneleftrifed from a non-ele£tric eleftrifed out of the bottle, inthis : that the eleftrical fire of the latter is accumulated onits furface^ and forms an eledlrical atmofphere round it ofconfiderable extent: but the eleftrical fire is crouded intothefubflance of the former, the glafs confining it. 2. At the fame time that the wire and top of the bot- tie, &c. is eledlrifed pojitively ov plus^ the bottom of the bottle is eledlrifed negatively or minus^ in exaft propor-tion : /. e, whatever quantity of eledlrical fire is thrownin at top, an equal quantity goes out of the bottom. Tounderftand this, fuppofe the common quantity of Eledri-city in each part of the bottle, before the operation begins,is equal to 20 ; and at every ftroke of the tube, fuppofe aquantity equal to 1 is thrown in; then, after the firftftroke, the quantity contain d in the wire and upper partof the bottle will be 21, in the bot
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