Electricity for public schools and colleges . Fig. i. current. Thus, in fig. ii. we see how a horseshoe magnet acts uponsuch a discharge ; the discharge is infiected. By means of a more complex piece of apparatus the discharge canbe caused to rotate about a magnetic Fig. ii. {6) Action of parallel discharges upon one another. Dr. Crookes has recently verified experimentally that two paralleldischarges in a low vacuum obey Amperes laws of parallel currentsgiven in Chapter XVIII. § i6. § 15. Discharge in High Vacua. The remarks made in (a) and (?) of § 14 apply also to the presentsection.
Electricity for public schools and colleges . Fig. i. current. Thus, in fig. ii. we see how a horseshoe magnet acts uponsuch a discharge ; the discharge is infiected. By means of a more complex piece of apparatus the discharge canbe caused to rotate about a magnetic Fig. ii. {6) Action of parallel discharges upon one another. Dr. Crookes has recently verified experimentally that two paralleldischarges in a low vacuum obey Amperes laws of parallel currentsgiven in Chapter XVIII. § i6. § 15. Discharge in High Vacua. The remarks made in (a) and (?) of § 14 apply also to the presentsection. We now proceed to mention briefly the phenomena peculiarto high vacua. To Dr. Crookes is due our knowledge of these inter-esting and beautiful phenomena. (a) Let us suppose that the tube in the figure has a negative poleat the centre, and a positive pole at each end. 3So ELECTRICITY CH. XXII. When the exhaustion is what is usually called good for a lowvacuum, say, for example, that the pressure is only half a millimetreof mercury or about yr^^,^ of an atmosphere, there is observed on eachside of the negative electrode a dark space, this space being boundedby a brilliant luminosity. Many experiments tend to show that theextent of this dark space measures the mea
Size: 2651px × 943px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpubl, booksubjectelectricity
