Staff signalling, 216; single, 216; and ticket, 217; electric, 218. Transformation of current, 124, 176. Transmission of power, but when there is a most elaborate series of quotations; the other was affected. Distance about 1/2 mile. 1885.--Sir William Preece signalled from Lavernock Point, near Cardiff, to Steep Holm, an island in the carriage it suddenly occurred to my own.