! 
PROFESSOR THOMSON ON THE ELECTRO-DYNAMIC QUALITIES OF METALS. 689 
K) N- ^ - 
O 9) to CO 5 
Time in minutes and half- 
minutes from commence- 
ment of current. 
o n g o o M 
Entering by end ^Entering by endg'Entering by end 5 Entering by end g'Entering by end ^'Entering by endg 
nextB. c§ next A. ^ nextB. (g next A. next B. (g next A. ?? 
fD fo 0 r& ft ft* 
Current. 
q5Cnfti»^»^W03WU>fc*N— i--ooooo«OGo^ciC^**^rf^rf^wwc^co)ti*.c^t^t^wfc^H-oa5>i^'^'^ft^fc9oobO(Xfc9co 
*^■^1— db--’^wcoobrfl(»cc«095*fi‘d505^cS9»k^C5**^cnt^db9i>ucji'^diOOcoaiwCoooo — cccsobobocirfi'^^'i^ 
rfi.H-G0>t^C0OO^tS)^'<rOt59fO9i^C0ftiO'— CiN-OOiii'-tatSOOOOOOOOOOOOOiii^OOOOOO 
Observed temperature 
at A byKew, No. 114, T^. 
WtCL-f^OOCpCC0pC»G0'^'*4'*<t^'*^’*^C^«^4^C0t^--i--pOOp“H-l>pfc«O<:»'M9^*fc^N-C0C;CCCpa5fc4iC0tf»*H-Gp 
■— ’*^iuo’*^d;di*^dbMl-i^ci5fcbi:irfii^cb'^Qb^'^cib>--':o»ii-o9»'i>u>kUood50Vx’Mtj)Coo*^oi9 
4i^OC04i-ft^C0^(XC5ftiC0?D0a'i0OO:0C0OC0t0»--t«OG0tnOOOOOOOOOOOOOOOOOOOOOO 
Observed temperature 
at B by Kew, No. 91, Tg. 
pppCCppp»Urf^pppppt«t0ppppppt9p&9CCt0b9fc9t^pCr200i^ppCi9iC^CnpO9^C^k^pi-^p 
00-— U)’^N(^cboO'^rfi‘COfcoofticofci)?£>oc)b9<coi^^i— 
O^00tt^'<»cc^05ci(x^?0tc09ifc©0ft^'0^ftcnc©0^0tafc000c00000c0000tt^000000 
Difference of observed 
temperatures — Tg = D. 
CO CO fcO ^ 
0 G) to CO D 
^C5ftT>fk.COfcO>— 0'<>Cift't<^COtON-O^CiC7X>fi.COtO*— O'<»05ft»tf^C0t0i-iO^05Cr»it..C0U>--O'^05ftt>^C0tCi^O 
Time in minutes and half- 
minutes from commence- 
ment of current. 
0 g 0 0 g g 
Entering by end ^'Entering by end ^'Entering by end ^'Entering by end ^'Entering by end ^'Entering by endg" 
nextB. next A. nextB. c§ ne.xtxi. tn nextB. next A. 
ft ft ft (t ft 
Current. 
^V»-«<»’<|^^’<l"*»^’<J'M"<»'<r*^'<»Ci0tCiCt0tCtGia5C5950t9SCi0tC5CiC3a5C50tC5C50tCiCiC5OtCiC5CtC5Ct0tCi 
rf^ppi^fcGt:;pppppfc«tpp?Opppp'*^’Mpp':OppGOpGO^'^pOtC5ft<C?tppft»G5pa50tO;C5ppp 
00^GCG5i--O>P^^Ofti“«0Ot0t«ftiU)Oa5^0^OC0C0C0H-^C0GCC7<?Dt0rf^€CH-#-rfi.C0t0C0«C>OC5GCOOC0H- 
Observed temperature 
at A by Kew, No. 1 14, Tj^. 
I^ppp'pppppppp^'^pppc^c^ti^rf^rf^h(^rf^rfi».4^*-»t..ii^t^>*^rf-ppt'0t0t0t0t>0l'0bfl'0l'0wppwp 
►-<>'-^^Oob’^«Gccft»i;«0’^o<^'{^«oc^O'^9»6bco*^‘t^>i^i^cocb — 0‘^*^t'«co^6iCocbc^^c»ti)H— 
OO9iC0Q0t0t09iOOOOOG0CnO^OC0t0OC0t000C»C0»— CGOCOH-Cfi — CCCOCsOtO — :iOCOOtOh-tOOO»— 
Observed temperature 
at B by Kew, No. 91, Tg. 
ppppppi{:^);^Cn4:^>(^);^»;^pppppppCOCoCOtU.»U4^t;i>^rf;k.COppfcftOtOt9fcCppppppCOCOpptpp 
Oi— NliitC)Cjtc0»(^^N^c5G0CrTC0C0tbO'--O’--i— Codi^ftCnCOtGi— ©COCiOCi«ft«ft^ft«ftOW»l^'^^cbct>£i^i— 
CO^COCOCO'XU(CiOftiK-©Orfi^'vitn>— ■©CO©tntO©tn9iCOOt4i«^COU)QO'<JCON-ooCOt»->— H-rfi..C>Oi*i-'<JC0O©O 
Difference of observed 
temperatures Ta — Tg = D. 
Oi Ci 0 Ox Ox — 
00 0 a to 00 p 
'<l©ftirfi>^COtO>— O*^©Cnkfi^C0t0H-O'<l©9i4i^C0tSi— •OM©ft'>C^C0t0^O'<»©Cnst^C0t4>i-*O^©ft»rf^C0fcCi— ‘O 
Time in minutes and half- 
minutes from commence- 
ment of current. 
, g . g 0 0 g g 
Entering by end £ Entering by end ^'Entering by end g'Entering by end g'Entering by end ^'Entering by end ^ 
next B. t§ next A. next B. ^r iiext A. eg next B. <g next A. ,g 
ft 0 ft ft ft ft 
Current. 
pp'^'^ppppppppp*^O5Gt©©t>iC5tC;nCiCjxCjitnrfi..)ii**C0C0tSt— ^>--^- 1 — 
cb4^«ow«5c>db>ufttcjicnrfx^C5tbrfi.Hl-l-(»i^t4>Nl.i-i*tjii^cbco»^i^cbrfil-— — i-^tbcjtcodicsNl- 6!:cocbfciut?ii©fj^ 
Oh-**- •OO'— OOO t^‘‘©Ot5OOOfti>t^t«^C005t5©Ot©t0N-f0O00t0C0fcti-tnC0Q0©^tttC0Ui©H-C0C0it'^C5 
Observed temperature 
at A by Kew, No. 114, T^. 
^^‘f^rf^ppfcGUippppppppppptxOtOUr'H- — 000©©©c»00 00coppppp0p0pp'^‘7— - 7 *^ 
— ’*^t^)i^^i^G^cjiCiCiCji'^©CO©4^0d5'— '^C5COCbftifc«COcn5^'^'^<^'^^^ti*^'^'*^COOCO*UCiCji 
OU>t0ftTOO©©H-OO^OOCnt0O9iO©C0H-00C;iO©tC»C0t5O5t^^®^*^®®*‘®^^®®®'^®^‘^ 
Observed temperature 
at B by Kew, No. 91, Tg. 
pppppp>^ppC«C^rf^rf^J^pfcOfc«fcGfcf!COCOpCO*^ifi^ttH,is*.>l^CoCOU)tOfcOfc9fcftOtOpprf^a^4^>l^4^ppptO 
^5^Ci^(X©COtO*^N— O<X9?OC0©9i’^©Ofcic^©(Xaifti*Ui-l*?C^©fti9fCjiG5-M©k^C0’M^©C^U)©ftiOfft 
OOOWO'— rfi^rf:H©rfi.O00fc0O9»C0Cn©U>H-O9frfi.H-Ot5O00’MOfcCiC0fc0ttHt5©C0O'^t&O^O^C0C0Q000 
Difference of observed 
temperatures Tj^ — Tg = D. 
S ^ CO 00 00 '^rj 
to CO 0 © tcB 
©MC5Cn^^;H05^CH-0'<^©ft^rf^CotCl^O^Cift1^^;^COtO^— O^©ft^'C^C0t5h-O’O95ft<>f2*‘C0t0>--O'*^©ft^rfi*-C0t0i— ‘O 
Time in minutes and half- 
minutes from commence- 
ment of current. 
1 Entering by endg Entering by end g'Entering by endg Entering by end g'Entering by end g'Entering by endg' 
1 nextB. eg next A. en nextB. (g next A. eg nextB. eg next A. eg 
ft Q 0 ft ^ « 
Current. 
) 
S^^^i^'^^^^*^^^’!^*^^^'^^'^^'^'^'^^°'>0'0 00 30QCGCGCO0(X00a)GOCC00 00aDa0Ci0 00 00CCQ0CC00 0C00'^'O 
i “Acbcj<cwAowd>oti'E..l.tb.Eeo^ig.i^K:.tiit^^.CiiiLcc5b(ioii:ji'i 
'^^^O'^OOh— |||i.cOCOOOOO«OO^Sl— 'Uii— '©COOO^— 05tOO!S»-OJOi— 'QO^OC^OCOCO' kIh-OM— ‘OtO 
Observed temperature 
at A by Kew, No. 114, T^. 
wiwtw»H^tXt©H-i-->--i--i--|>pi^CO*f^Cno*p©©©'Vj»».4VJOCi©©©OOOOH-i— 1— 
w(^ti?<^QnOCnOOPfOO*M'*^0tC0C;iUjO00»t-.00OC0©'*^tt*-CnOtC0t©O‘--OOU»OO'--‘ft’*C0t0©00O»-->— ‘OO 
Observed temperature 
at B by Kew, No. 91, Tg. 
1 ^^^C04^COpt^*^rf^COpppl:Gt9fcOtOl9tGppt{^pC^C;ip*fHrfi.rfsi.>t..COCOCOCOCO>tHrf;HC7iCi©©©tnfti>*H05CO 
©©2SoDSS^^X^l^iS^*7^^!r^2'^^^9^^^^*^'^*^COrflHl--^(:o4i-ai.©©U>CnOOCOCOb«©CitOCCCO 
1 ^^‘^C®CO©»P>..(XCiO©COCO>t*.OtCnOH-»t^*<ltO©Cn04H.bti*..OiPifO©©H-*CO'<lO^©Cr^bCiH-*CXCOO — Oft^O 
1 
Difference of observed 
temperatures T a — Tg = D . j 
61. Iron conductor licntcd by electric current. Ends kept cool by streciins of wnter about 6 Cent. IVIarch 2.5, 1854. 
