. Technical paper. Figure 4.—Cross section of electroscope withdetachable ionization chamber (one-third size). BUREAU OF MINES TECHNICAL PAPER 88 PLATE I. A. ELECTROSCOPE WlTr ij i cK^hANGEABLE IONIZA-TION CHAMBERS. THE ELECTRIC-LIGHT SOCKET ANDWIRE ABOVE THE INSTRUMENT ARE NOT PART OF IT.

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou