Printed below top picture on original print, as caption - (a) Edison’s Dynamo, Vertical Type, 1870-1880 Typical of Edison’s early dynamos the field magnets were unduly long. Association with Hopkinson later resulted in a shortening of the cores to what became usual practice. (Photo: Science Museum)
Printed below bottom picture on original print, as caption - (b) Brush Dynamo, 1878 (Photo: Science Museum)
Penciled on back – 14-1/4×9
Photo of print used for exhibition purposes – historical persons in the development of electricity & electrical engineering. Possibly reproduced by Mr J.F. Bryce.
Wrapped in tissue paper.
2 early dynamos, 1870 – 1880 1 B&W photo print
Picture (top) – (a) Edison’s Dynamo, Vertical Type, 1870-1880 (bottom) – (b) Brush Dynamo, 1878
Photo of print used for exhibition purposes – in the development of electricity & electrical engineering. Possibly reproduced by Mr J.F. Bryce.
Any use of this image must be accompanied by the credit “Horowhenua Historical Society Inc.”
