Old clocks and watches & their makers : being an historical and descriptive account of the different styles of clocks and watches of the past, in England and abroad, to which is added a list of nearly twelve thousand makers (1922)
Britten, F. J. (Frederick James), 1843-1913, Britten, Annie · London : E. & F. N. Spon · leaf 488
t pointed to the time, and then gradually crept tothe figures in succession as the hours advanced. Underneath therim of the bowl was a magnet of the horseshoe type, which wascaused to revolve once in twelve hours ; the tortoise was of cork andcarried the keeper of the magnet. By the same agency he… … Fig. 621.—Magnetic Timekeeper.
Clocks and watches · Clock and watch makers
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