MARC record from Internet Archive

LEADER: 02978cam a2200469Ii 4500
001 ocn914909380
003 OCoLC
005 20190906133815.0
007 ta
007 cr cn ---muaua
008 150728e196406 txuae bt f000 0 eng d
035 $a(OCoLC)914909380
040 $aUDD$beng$erda$cUDD$dOCLCO$dOCLCQ$dUDD
049 $aUDDD$oLAC mdm$obesASS
090 $aHD9660.H43$bM56 no.51
100 1 $aMcVey, James R.
245 10 $aHelium Research Center internal report :$ban RC bridge and detector for the measurement of small capacitance changes /$cby J.R. McVey and J.L. Gordon.
246 14 $aBureau of Mines, Helium Activity, Helium Research Center Internal Report
246 3 $aRC bridge and detector for the measurement of small capacitance changes
260 $aAmarillo, Tex. :$bU.S. Department of the Interior, Bureau of Mines, Branch of Laboratory Services,$c1964.
264 1 $aAmarillo, Tex. :$bU.S. Department of the Interior, Bureau of Mines, Branch of Laboratory Services,$c1964.
300 $a17 leaves :$billustrations (some foldout), plans℗;$c28 cm.
336 $atext$btxt$2rdacontent
337 $aunmediated$bn$2rdamedia
338 $avolume$bnc$2rdacarrier
490 1 $aHelium Research Center Internal Report / U.S. Department of the Interior, Bureau of Mines ;$vno. 51
504 $aIncludes bibliographical references (leaves 9-10).
520 3 $aAn instrument for the purpose of detecting small changes in air dielectric capacitance is described. It consists of an RC bridge circuit with the associated power supply and detector. The bridge has a 26 VAC input and sine wave output which is compared with a square wave in the detector. The dc output from the detector is a measure of bridge unbalance in millivolts, with a minimum sensitivity of 10́℗đ pico-farads at 200 pico-farads. The bridge and detector assembly were designed to monitor the rate of diffusion of gases and were used successfully for this purpose. A small change in gas mixture composition changes the gas-dielectric constant; therefore, the capacitance value of a small air-type capacitor inserted into the gas mixture changes proportionally, and is recorded as a function of time.
500 $a"June 1964."
500 $a"Branch of Laboratory Services, Project 820.1."
650 0 $aHelium.
650 0 $aCapacitance meters$xDesign and construction.
650 0 $aDielectric measurements.
650 7 $aHelium.$2fast$0(OCoLC)fst00954719
650 7 $aCapacitance meters$xDesign and construction.$2fast$0(OCoLC)fst00846195
650 7 $aDielectric measurements.$2fast$0(OCoLC)fst00893113
700 1 $aGordon, J.L.
710 1 $aUnited States.$bBureau of Mines.
710 2 $aHelium Research Center (United States. Bureau of Mines).$bBranch of Fundamental Research.
830 0 $aHelium Research Center Internal Report (United States. Bureau of Mines) ;$vno. 51.
994 $aC0$bUDD
920 $aBLM Library$hHD9660 .H43 M56 no.51$t1$jOn the Shelf