CIHM 
 Microfiche 
 Series 
 (Mononraphs) 
 
 ICMH 
 
 Collection de 
 microfiches 
 (monographies) 
 
 Canadian lnstit--to for Historical Microroproductions / (nstltut canadien de microroproductions historiques 
 
 
Technical and Bibliographic Notes / Notes techniques o; bibliographiques 
 
 The Institute has attempted to obtain the best original 
 copy available for filming. Features of this, copy which 
 may be bibliographically unique, which may alter any of 
 the images in the reproduction, or which may 
 signi^cantly change the usual method of filming are 
 checl:ed below. 
 
 n 
 
 Coloured covers / 
 Couverture de couleur 
 
 j I Covers damaged / 
 
 Couverture endommagee 
 
 □ Covers restored and/or laminated / 
 Couverture restauree et/'ou pelliculee 
 
 Cover title missing / Le titre de couverture manq'^e 
 
 I I Coloured maps / Cartes geographiques en couleur 
 
 □ Coloured ink (i.e. other than blue or black) / 
 Encre de couleur (i.e. autre que bleue ou noire) 
 
 □ Coloured plates and/or illustrations / 
 Planches el/ou illustrations en couleur 
 
 jund with other matehal / 
 Relie 3vec d 'autres documents 
 
 Only edition available / 
 Seule edition dispomble 
 
 Tight binding may cause shadows or distortion alc^.g 
 interior margin / La reliure serree peut causer ce 
 I'ombre ou de la distorsion le long de la n-iar:e 
 interieure. 
 
 
 1 Blank leaves added during restorations may appear 
 
 within ihe text. Whenever possible, these have been 
 
 omitted from filming / II se peut que cerlames paces 
 blanches ajoutees lors d'une restauraticn 
 apparaissent dans le texte, mais, lorsque cela etsit 
 possible, ces pages n'ont pas ete filmees. 
 
 L'Institut a n'icrofilme le meilleur exemplaire qu'il lui a 
 ete possible de se procurer. Les details de cet exem- 
 plaire qui sont peut-etre uniques du point de vue bibli- 
 ographique, qui peuvent modifier une image reproduite, 
 ou qui peuvent exiger une modification dans la melho- 
 de normale de filmage sont indiques ci-dessous. 
 
 I Coloured pages / Pages de couleur 
 
 I [ Pages damaged/ Pages endommagees 
 
 n 
 
 Pages restored and/or laminated / 
 Pages restaurees et/ou pelliculees 
 
 I ~y Pages discoloured, stained or foxed / 
 I I Pages decolorees, tachelees ou piquees 
 
 Pages detached / Pages detachees 
 
 x/j Showthrough /Transparence 
 
 □ Quality of print varies / 
 Quality 
 
 □ 
 
 n 
 
 !6 inegale de I'impression 
 
 Includes supplemen .ry material/ 
 Comprend du mate' el supplementaire 
 
 Pages wholly or partially obscured by errata slips, 
 tissues, etc., have been refiimed to ensure the best 
 possible image / Les pages toialement ou 
 parliellement obscurcies par un feuillet d'errata, une 
 pelure, etc., ont ete film^ees a nouveau de fafcn a 
 obteriir la meiHeure im.age possible. 
 
 opposing pages with varying colouration or 
 - discolourations are filmed twice to ensure the best 
 possible image / Les pages s'opposani ayant des 
 colorations variables ou des decolorations sont 
 fiimees deux fcis afin d'obiemr la meilieure image 
 possible. 
 
 □ 
 
 /| Additional comments / 
 
 Commentaires supplementaires: 
 
 Continuous pagination. 
 
 This iicm is Mmed ai ihe reduction ratio checked below / 
 
 Cc document est lilme au tau« de reduction indiqui ci-deitoul. 
 
 lOx 
 
 
 
 
 14x 
 
 
 
 
 18x 
 
 
 
 22x 
 
 
 
 
 26x 
 
 
 
 
 30x 
 
 
 
 
 
 
 
 
 
 
 
 
 1 
 
 1 
 
 
 
 
 
 
 
 
 
 
 
 
 
 2x 
 
 16x 
 
 20x 
 
 24x 
 
 2ex 
 
 32x 
 
The copy filmed here has been reproduced thanks 
 to the generosity of: 
 
 D.B. Weldon Library 
 University of Western Ontario 
 
 L'exemplairo film^ fut reproduit grace & la 
 g^n^rositd de: 
 
 D.B. Weldon Library 
 University of Western Ontario 
 
 The imeges appearing here are the best quality 
 possible considering the condition and legibility 
 of the original copy and in keeping with the 
 filming contract specificationa. 
 
 Les images suivantes ont At6 reproduites avec le 
 plus grand soin, compte tenu de la condition et 
 de la nettet^ de I'exemplaire filmt. et en 
 conformity avec les conditions du contrat de 
 filmage. 
 
 Original copies in printad paper covers ar ilmed 
 beginning with the front cover and ending on 
 the last page with a printed or illustrated impres- 
 sion, or the back cover when appropriate. All 
 other original copies are filmed beginning on the 
 first page with a printed or illustrated impres- 
 sion, and ending on the last page with a printed 
 or illustrated impression. 
 
 Les exemplaires originaux dont la couverture en 
 papier est imprimAe sont filmAs en commenpant 
 par le premier plat et en terminant soit par la 
 dernidre page qui compone une empreinte 
 d'impression ou d'illustration soit par le second 
 plat, selon le cas. Tous les autres exemplaires 
 originaux sont filmAs en commenpant par la 
 premiere page qui comporte une empreinte 
 d'impression ou d'illustration et en terminant par 
 la dernidre page qui comporte une telle 
 empreinte. 
 
 The last recorded frame on each microfiche 
 shall contain the symbol — ^ (meaning "CON- 
 TINUED "). or the symbol V (meaning "END"), 
 whichever applies. 
 
 Un des symboles suivants apparaitra sur la 
 derniAre image de chaque microfiche, selon le 
 cas: le symbole — ♦• signifie "A SUIVRE' . le 
 symbole V signifie "FIN". 
 
 Maps, plates, charts, etc., may be filmed at 
 different reduction ratios. Those too large to be 
 entirely included in one exposure are filmed 
 beginning in the upper left hand corner, left to 
 right and top to bottom, as many frames as 
 required. The following diagrams illustrate the 
 method: 
 
 Les cartes, planches, tableaux, etc., peuvent etre 
 film^n d des taux de reduction diff^rents. 
 Lorsque le document est trop grand pour etre 
 reproduit en L-n sjuI cliche, il est film6 A partir 
 de Tangle sup^rieur gauche, de gauche d droite. 
 et de haul en bas, en prenant le nombre 
 dimages n^cessaire Les diagrammes suivants 
 illustrent la mdthode. 
 
 1 
 
 2 
 
 3 
 
 1 
 
 2 
 
 3 
 
 4 
 
 5 
 
 6 
 
P03l3 Ai 
 
 depart.mknt of the interior 
 
 CANADA 
 
 llns. A. .Mi,i,,hi:n. A/i;„..<,Vr W. W . V.;:y, C.M.G.. /J,.y,«^v Monster 
 
 PUBLICATIONS 
 
 Dominion Observatory 
 
 OTTAWA 
 
 Otto Ki.oi;^. [.I..n.. f). S... Direclnr 
 
 Vol. Ill, No. 12 
 
 Orbit of the Spectroscopic Binary 
 
 125 Tauri 
 
 BY 
 
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 elements are : 
 
 P = 27- 804 days 
 
 ( = J.) 
 
 u = 33.'/ 
 
 A' = 25-.') km. 
 
 7 =14-8 km. 
 
 T = 2,420,471 tio: M). 
 
 a sin i -= 8,1<')().()()0 km. 
 
 c 
 
 "i 
 
 
 it will tic seen thai the rc.-idual.s are miiiMially larjic aiul thai the 
 form (if the curv, which woulil wi thn.ush. or appniximatcly thnmnh. all 
 the mirmal placi- would sun^jcsi the results of iilends. Starting at phase 1 
 (on curve) it will he seen thai the residuals liecome negative and contnuie 
 .so until atiout phase (i days, when they heconie positive. They remain 
 positive until about phase II days. 
 
 The similar featun- is marked in the uii-curve. This would he tlu^ 
 
 effeci of a hlended spectrum caused In the liiiht of the second body of 
 
 the system if its spectrum were atTccting the liiK.s of the .siiectrum of the 
 
 primarv. It is impossible to say whether the curve niven is low enough 
 
 tit th(' nnnimuni or hit;h enouy:h at the maxinmm. .Mthoutih, on ,some 
 
iMiHir 111- iiii; >ri;( iitiiM (ii'K hinakv 12.") iaiki 
 
 t.'.") 
 
 'Illi''' "I' li>in' |j|:iti'> <illi' III- two line- >lin\\ a suspicion of (iuiiiiiiiic;, lliirr 
 
 III'' none clraiix' riioiiiiii c|i'liii"il to iiirasurc. so that llicir i> no |io>>iMc 
 inraii,- ol' .In , i niininii the inir nia\iiniiiii and iiiininiiini. Mr. I.rc in iiis 
 aniioiincciiicni ol ilic iIiitc nica-uri'- ri't'iTn.l lo aliosc, (Icscrilio iIm' lines 
 a- •■ ^irnoli'." aliiioiiiih one of ]]\< ])lal('s is taken at the !na\ini;iin ol ijic 
 curve. 
 
 Ilie lines of tile -peetiiiin. a It 1 1. iiiiili not i^ooi] at all. >lioiili| all(j\\ of 
 nnn-h closer nua^nrenieni than the ie-i(hial> indicate, and the lilet.d theorv 
 -eeins the onlv one thai Would e\|)lain the rey:\ilar variation of the n^iduals 
 "' 'III' iioiinal places. Sunilar etf'ects lia\e lieen found in sv.steni- uhen 
 the -econdan- \\-a< lieen nieasural)le at tlie niaxiinuni and niinirniiiii 
 
 
 Xo least-s(|uare> -olution was ajjplied as any ctTcct tlie solution niinht 
 have, could hardly sci\-e to approacli nearer tlie true elenieiits than those 
 arrixcd at uraphically. On account of tlie probability of blends atTectin^; 
 the \cloi'ities of the ])lates, no probable error was computed fo|- cither 
 normal i)laces or indivi<iiial plates. 
 
 I )oir.inion ( >b>er\atory 
 Ottawa 
 
 June, I'.llli. 
 
 Days ?