โ Scribed by Dunstan, A. E.
No coin nor oath required. For personal study only.
lOlS CHIEhlISTI~Y AND INDUSTRY I I W . 12, 111:10
former. Tlic piece of refcrcncc ciil)le, :i sliort Icngtli of :il)out 1 ft. of tlic originnl ciil)Ic, is Icnd-cnppctl i i t cncli end \vittIi nn insulntiiig ring to prevent. licnt flow, nncl n few of tlic centre wires of tlic corc nrc \rithdrn\rn nnd rcplnccd lip n sninll Iimtcr of copper wires. Tlic prininry of o ciirrcnt trnnsformcr cnrrics t,lic tiinin ciirrcnt, pnssing through tlic cril)lc, :iiitl tlic sccondory winding siipplics tlic cnrrcnt, for tlrc licntcr of the rcfcrcncc cii1)Ic.
'k resiststice of the lientcr is so proportioned tlint tdic \t-nt.t-Ioss in the refcrencc cnMc pcr foot r m , wlieii fed \*it11 tlic sccoiidnry ciirrcnt of thc triinsforiiicr, sny, 6 iimp. is the snnie :is tlic wiitt loss pcr foot iiin in tlic ni:iin cnlilc a t tlic nctrinl Iiigli-tension ciirrcnt.. d tlicrniocoiiplc is inscrtcd in contact with tlic core of t]w rcfcrcncc cnhlc : i i d n second coiiplc is joiiictl to tlic sliciith, I)cing coniicctctl i i i oppositio~i so :is to iiic:isiirc tlic differcncc l)ct\vecn tlic corc nnd s1ic:ith ternpcr:itiircs of tlic rcfcrciicc c:iMc. 'I'hc!sc two thcrrnocouplcs iirc also conncctotl in series wit11 :I third tlicnnocoiiplc iittiiclietl to tlic slicntti of tlic ii>iiin ciihlc \vliosc core r ciiipcr:it tire is rcqiiirctl.
By A. E. DUNSTAN, DSc. Tlic i ~i t c r -d e ~~c ~~t l c ~i c y of nII industrics is per11:i~i~ iiiorc mrirkctl in tlic c : w of pctrolcuni tliciii in niiy otlicr, i n view of the fiict, tlint 1nii1cri11 oil to-thy is :I niost importiiiit supply of raw i1i:iteriiil nnd cncrp, piirtiCil-
๐ SIMILAR VOLUMES
Tlic oiitstniitliiig fciiturc i i i tlic pctrolculn iiidustry cluriiig tlic pist ycnr Iins iiiitloubtcdly becii its pnrticiptitioii iii tlic gciicriil stiite of c1cl)rcssioii tlirougli-OUL tlie \vorld. Tlic mni~ifoltl cnuscs of tliis stiitc of iiffiiirs, siicli :is tlic world-wiile ccoiioiiiic f;ill