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Scientific American, Vol. 55, No. 20 (1886) (1886)
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limiter is substituted WHHL. armature. The end of this arm bears against for the pair of separate limiters of the original. the upper limiter. An electro-magnet operates this armature, and is situated below it in the The result isa more compact instrument. A bottom of the box, and is connected to… … © 1886 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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