GALVANOMETERS of innumerable kinds abound, and each form has some special merit which renders it useful for certain restricted services. The old astatic instrument of Nobili is still preferred by many ...

I MUST confess that I was surprised by Mr. R. E. Baynes' communication, in NATURE, vol. xix. p. 33, that the galvanometer I have proposed in NATURE, vol. xviii. p. 707, has already been described.

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. A galvanometer with a glass cover and ...