Electrical timekeeping.
Hope-Jones, F. 1867-
Electrical timekeeping. With a foreword by Sir Harold Spencer-Jones. - 2d edition. - xxiii, 279 pages : illustrations, portraits ; 23 cm
49028377
Clocks and watches, Electric.
Clocks and watches, Electric.
Horloges et montres.
Clock (general) United Kingdom Synchronome Electrical Making General
Electrical timekeeping. With a foreword by Sir Harold Spencer-Jones. - 2d edition. - xxiii, 279 pages : illustrations, portraits ; 23 cm
49028377
Clocks and watches, Electric.
Clocks and watches, Electric.
Horloges et montres.
Clock (general) United Kingdom Synchronome Electrical Making General