Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 299
ferent lines. Thelines are divided into four groups, (1) the metro-politan, (2) short provincial, (3) medium provincial, (4)long provincial ; the first being wires passing to pointsin London only, the second to places within about 50miles of London, the third to more distant places, andthe fourth… … CHAP, xviii.] GREENWICH TIME AND USE MADE OF IT. 277 four relays—the left-hand four shown in Fig. 130—are allacted upon by the Greenwich signal and therefore actsimultaneously, each relay sending a portion of thecurrent of its battery through each wire of its group.The metropolitan group, being…
Astronomy · Telescopes
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