Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 623
Fig. 292.— The Mirror Galvanometer. slit, B, in the centre, beliind which is placed a paraffin lamp, D. The screenIs provided with a paper scale, C, divided into equal parts, and is placed atthe distance of about two feet from the little mirror. It follows, from thisarrangement, that when the light…
Inventions
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