Relay, [25], [39], [49], [53], [55], [60], [75]
differential, [79]
polarised, [97]
Reproducing for newspapers, [60]
Resistance of selenium, [109]
of selenium cells, [110]
regulating, [113]
Retardation of current, [6]
Retouching, [62]
Relay, [25], [39], [49], [53], [55], [60], [75]
differential, [79]
polarised, [97]
Reproducing for newspapers, [60]
Resistance of selenium, [109]
of selenium cells, [110]
regulating, [113]
Retardation of current, [6]
Retouching, [62]