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 30
Fig. 12.—Section of Drum. Fig. 13.—Front View. Fig. 14.—Side View says : The dial was composed of twelve small doors, wliich repre-sented the hours ; each door opened at the hour it was intended torepresent, and out of it came the same number of httle balls, which fellone by one, at equal intervals…
Clocks and watches · Clock and watch makers
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