_Yoke._—Is a term applied to the apparently neutral mass of iron which connects the poles of a horse-shoe magnet at the back. [Illustration] APPENDIX I.—PRINCIPAL ELECTRIC LIGHTING STATIONS IN GREAT BRITAIN. -----------+--------------+-------------+-----------+-----------+ | Approximate | |Approximate| | |No. of Lights.| | length of | | Name of +--------+-----+ Systems | longest | Main | Station. | Incan- | | employed. | main | conductor | | descent| Arc.| | supply |overhead or| | or Glow| | | conductor |underground| | Lamps.| | | in miles. | | -----------+--------+-----+-------------+-----------+-----------+ Brighton | | |High-tension | | | Electric- | 1,800 | 40 | lamps in | 20 | Overhead | Light | | | multiple | | | Company | | |series Brush | | | | | | Dynamos | | | -----------+--------+-----+-------------+-----------+-----------+ Cadogan | | | | | | Electricity| | | Edmunds’ | | | Supply | · · | · · | system | 2 | Overhead | Company | | | of Battery | | | (New | | |Transformers | | | Company) | | | | | | -----------+--------+-----+-------------+-----------+-----------+ | | |Lowrie Hall | | 7 miles | Eastbourne | 1,700 | 30 |Transformers | 15 | under- | | | | | | ground | -----------+--------+-----+-------------+-----------+-----------+ | | |High-tension | | | Grosvenor | | |with Ferranti| 6 | | District | | |Transformers | circuits, | | Electrical | 20,000 | 40 | primary | total | | Supply | | | 2,400 volts,| about | Overhead | | | | secondary | 70 miles | | | | | 200 volts, | | | | | | Ferranti | | | | | | dynamos | | | -----------+--------+-----+-------------+-----------+-----------+ Kensington | | | Crompton | | | Court | 1600 | | 105 volts | | | Electric | to be | · · | low-tension,| ¼ |Underground|