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✦   LIBER   ✦

Jahresbericht VII Der Chemisch-Technischen Reichsanstalt, 1928. Pp. xi + 275. Berlin: Verlag Chemie G.m.b.H., 1929. 24 rm

✍ Scribed by Thomas, J. S. G.

Book ID
102322975
Publisher
Wiley (John Wiley & Sons)
Year
1930
Weight
349 KB
Volume
49
Category
Article
ISSN
0368-4075

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✦ Synopsis

Thc anthor dcnls w r y fully with tlic fundnincntnl stnndnrd, such 11s t.hc y i r d or inctrc, on ~vliicli nny systcin of accurnte nicnsurciiiciit itiiist bc I~nsed.

Tho cliaptcr treating irpon this ninkcs vcry interesting rending nnd sl~ows tlic mcticiilous care cmrciscd in prcpnring tlic Stnndnrd Piirtl. In ordcr to avoid crrors the ilcfining lincs nrc plnccil a t tho 1)ottoiiis of tlic two holm on t,hc ncutrnl asis of tlic Imr, wliilst tlic hnr is supported at two points, distniit, 0.577 of its Icngt.11. Calculation nnd direct ~i i e n s ~~r ~~i i ~n t sliowctl t h t tliis mct.lioi1 wns as iiccurntc ns tlic origiiinl onc of floating in mercury. Refcrcncc is nintlc to the usc of thc \v:ivclength of light as a nntiiral h s i s for stnndnrds of length, and n vcry full description is givcn of tlie mctliods ndopted by hlicliclson to dcteriiiinc tlic tnetrc in WIVClengths, using tlic rctl rndi;it.ion from cndniiuni, also tlie work of lhiioit, Pnl)ry, ant1 I'crot sonic fourtccu ycnrs Iiitcr, nntl Iristly, that of ROIIIC Japnncsc invcstigntors in Tokio, 1928. !l!hcsc results t l i h by onc p r t in 6 niillion from those olttnincd by Fitbry rind Yerot, rind testify to iiicasureineiit.

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