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<p>Describes the construction of 4 mercury units of resistance at the Bureau of Standards, Washington. A number of tubes of Jena glass were procured and 4 others of "Verre dur," but the latter have not yet been used, although their calibre factors are somewhat less than those of the Jena tubes. The respective lengths, calibre factors, and masses of mercury contained by the tubes at 0 degrees 3C are as follows:- Table no. Length Calibre factor Mass of mercury at 0 degrees C 1 95.08231 cm 1.00008925 11.57474 gm. 2 96.26059 cm 1.00006593 11.86396 gm. 3 96.99623 cm 1.00004673 12.04271 gm. 4 100.69377 cm 1.00009587 12.97495 gm. The calculated resistances i
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<br>Subjects: electrical conductivity; measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties</div>
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