Observations on a series of electrical experiments / By Dr Hoadly, and Mr Wilson.

  • Benjamin Hoadly
Date:
1756
Catalogue details

Licence: Public Domain Mark

Credit: Observations on a series of electrical experiments / By Dr Hoadly, and Mr Wilson. Source: Wellcome Collection.

    22/80 page 18
    and this is the reafon why bodies give very nearly the lame figns, when they are eleCtrified either plus or minus. I fay, very nearly, becaufe when we come to examine the figns thefe bodies give (on being eleClrified in thefe different ways) with greater accuracy, we fhall fee a fufficient difference in thefe figns to enable us to fay which were eleCtrified plus and which minus. It will be worth while to flop here a little, and confider the different circumftances the eleCtrical fluid is in, that forms thefe fimilar atmofpheres around a body eleClrified plus, and one eleClrified minus. When a bar is eleClrified plus, the atmofphere formed round it lies between the air, [which refills its entrance into it more forcibly than the bar naturally does,^ and the bar, [which by being overloaded by electrification, re¬ fills its return into it, even when the excited tube is withdrawn, more forcibly than it does naturally] and by being thus circumflanced, its endeavour to expand is naturally exerted outwards from the axis of the bar on every fide, and it gradually difllpates itfelf into the air, and whilfl it is doing this, and no longer, the bar will remain eleClrified Whena bar is eleClrified minus, the atmofphere formed round it, which during the aClion of the tube that elec¬ trified it, lies in the fame manner between the air, and the bar, will, on that tube’s being withdrawn, exert its endeavour to dilate itfelf in a contrary direction, viz. from the furrounding air on every fide inwards to the axis
    digitised image 1
    digitised image 2
    digitised image 3