| RefNo | PP/22/2/2 |
| Previous numbers | PP/54/2 |
| Level | Item |
| Title | Diagrams, experimental equipment and results by Alfred William Porter |
| Date | 4 May 1893 |
| Description | Porter shares a circuit diagram, which he describes as follows: 'L is a coil of self-inductance L (= 0.42 henry) and of resistance R (= 28 ohms). S is a condenser of capacity S (= 5 x 10^-6 farads), and in the same branch with it is an inductionless resistance, r, the value of which can be varied. E is a battery which, when the circuits shown are complete, produces a current through L, and charges the condenser. A and B are the two contact pieces of a pendulum interruptor. The two circuits can be broken at these places by the pendulum: the time interval between the two ruptures being regulated by the distance between the contact pieces. One centimetre distance apart corresponds to 5.270 thousandths of a second, and, as this distance can be read easily (by a vernier attached) to a tenth of a millimetre, it is possible to measure intervals of 5 hundred-thousandths of a second.' The circuit diagram is followed by three graphs labelled 'Diagram accompanying note on flow in electric circuits'.
Subject: Electricity
Prints of these diagrams were published in volume 54 of the Proceedings of the Royal Society alongside the paper 'On the flow in electric circuits of measurable inductance and capacity; and on the dissipation of energy in such circuits'. |
| Extent | 4p |
| Format | Diagram |
| PhysicalDescription | Ink and graphite pencil on paper |
| Digital images | View item on Science in the Making |
| AccessStatus | Open |
| RelatedMaterial | DOI: 10.1098/rspl.1893.0043 |
Fellows associated with this archive
| Code | PersonName | Dates |
| NA8048 | Porter; Alfred William (1863 - 1939) | 1863 - 1939 |