Experiments and observations on electricity : made at Philadelphia in America . a-dily and eafily, without the leafl: fatigue ; efpecially if keptin tight paft:board cafes, lined with flannel, and fittingclofeto the tube.^—This I mention becaufe the Europeanpapers, on Eleftricity, frequently fpeak of rubbing thetube, as a fatiguing exercife. Our fpheres are fixed oniron axes, which pafs through them. At one end of the * Our tubes are made here of green glafs, 27 or 30 inches long, as bigas can be grafped. Eledricity is fo much in vogue, that above one hun-dred of them have been fold within the
Experiments and observations on electricity : made at Philadelphia in America . a-dily and eafily, without the leafl: fatigue ; efpecially if keptin tight paft:board cafes, lined with flannel, and fittingclofeto the tube.^—This I mention becaufe the Europeanpapers, on Eleftricity, frequently fpeak of rubbing thetube, as a fatiguing exercife. Our fpheres are fixed oniron axes, which pafs through them. At one end of the * Our tubes are made here of green glafs, 27 or 30 inches long, as bigas can be grafped. Eledricity is fo much in vogue, that above one hun-dred of them have been fold within thefe four months part. D axis i8 Mr B. franklins axis there is a fmall handle, with which we turn the fpherelike a common grindftone. This we find very commodious,as the machine takes up but little room, is portable, andmay be enclofed in a tight box, when not in ufe. Tis true,the fphere does not turn fo fwift, as when the great wheelis ufed : but fwiftnefs we think of little importance, fincea few turns will charge the phial, &c. fufficiently. Jam^ &c» B. LET- Letters on Electricity* 19 LETTER in. FROM Mr Benj- Franklin^ in Philadelphia^ t o Mr Pe TER CoLLINs oN, F* R. S* London, Farther Experiagents ^;^^Observationsin ELECTRICITY, 5 7i?, 1748. § I. ^TpHERE will Idc the fame exploiion and fhock,A if the electrified phial is held in one hand by thehook, and the coating touchd with the other, as whenheld by the coating, and touchd at the hook. 2. To take the charged phial fafely by the hook, andnot at the fame time diminifh its force, it muft firft be fetdown on an eledlric perfe. 3. The phial will be eleftriiied as ftrongly, if held bythe hook, and the coating applyd to the globe or tube 5as when held by the coating, and the hook applyd. D 2 4. But 20 Mr B. franklins / 4. But the dire5fion of the eledlrlcal fire being differentin the charging, will alfo be different in the bottle charged thro the hook, will be difcharged thro^the hook ; the bottle cha
Size: 1662px × 1504px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorburndylibrarydonordsi, bookcen, booksubjectelectricity
