Physico-mechanical experiments on various subjects, containing an account of several surprizing phaenomena touching light and electricity. Producible on the attrition of bodies. With many other remarkable appearances, not before observ'd. Together with the explanations of all the machines, (the figures of which are curiously engrav'd on copper) and other apparatus us'd in making the experiments / By F. Hauksbee, F.R.S.

  • Hauksbee, Francis, 1666-1713.
Date:
1709
Catalogue details

Licence: Public Domain Mark

Credit: Physico-mechanical experiments on various subjects, containing an account of several surprizing phaenomena touching light and electricity. Producible on the attrition of bodies. With many other remarkable appearances, not before observ'd. Together with the explanations of all the machines, (the figures of which are curiously engrav'd on copper) and other apparatus us'd in making the experiments / By F. Hauksbee, F.R.S. Source: Wellcome Collection.

    226/232 (page 192)
    [ ] wards, than inwards y and therefore ought to be diP charg’d that way. But then, becaufe the external Air is remov’d, there is no room for the lofs and recovery of an Equilibrium to take place; and corifequently no Flux of a Circumjacent Medium that way, and fo, no Direction of the Threads. For, Prop. 3. If the Electrical Matter be emitted in Phyfcal Lines, every where diverging from the Center of that Circle in which the Attrition is made, (or in the Plane of whigli the Hoof of Threads Hands) towards the Circumference of the fame Circle; then by the Rarefaction of the Medium contiguous to the Glafs, and the neceffary Prefure of the more remote and denfe Medium, into the Plane of that , fame Circle, with Directions contrary to thole in which the Effluvia are emitted: by this means (I fay) the Threads may be regularly directed to the Center of that Circle, in whole Plane the Hoop to which they are fix’d is plac’d. For the Flux of the denfe Medium will be in Directions ncontrary to thofe according to which the Rarefaction is > made. But the Effluvia are (by the HypothefsJ emitted in Phyfcal Lines, diverging from the Center towards the Circumference. Therefore the Rarefaction of the adja- ... cent Medium is according to the fame Directions. And ■therefore the Flux of the remote denfer Medium, is in Lines converging from the Circumference towards the Center. And all this (by the Flypothefsj being in the Plane of Attrition ; that is, in the Plane, wherein the Hoop of Threads ft and. s: therefore the Threads are in the fame Plane, wherein the Flux of the denfe Medium ,palles in Lines converging from the Circumference towards the Center. And therefore by the Action of the ■ faid Medium ^ the Threads may be for Pd into a regular Central Direction. Prop. 4. For the fame reafon ; If the Plane of At¬ trition be different from that Plane wherein the Threads are *