IMAGE EVALUATION TEST TARGET (MT-3) A * :^ ^ 1.0 ^Ui Ui ittlU 12.2 l£ 12.0 1.1 ■I u 1^ II& 1125 1^116 1^1. udoDGuS Qxporation IS \iniT MAIN siMRrr I, NX {7H)$7UUM Wi'f . ? ■■*%.^ CIHM/ICMH Microfiche Series. CIHIVl/iCIVIH ColScstion de microfiches. Canadian Inatitut* for Hiatorical Microraproductiona / Inatitut Canadian da microraproductiona hiatoriquaa Taehnical and Bibliographic Notaa/Notas tachniquaa at bibliographiquaa Tha Inatltuta haa attamptad to obtain tha baat original copy avallabia for filming. Faaturaa of thia copy which may ba bibliographlcally unlqua. which may altar any of tha imagaa In tha raproduction. or which may aignlf Icantly changa tha uaual mathod of filming, ara chackad balow. Tha tot L'Inatitut a microfilm* la malllaur axamplaira qu'll lui a At* poaaibia da aa procurar. Laa dAtaila da oat axamplaira qui aont paut-Atra uniquaa du point da vua bibliographiqua. qui pauvant modlfiar una imaga raprodulta, ou qui pauvant axigar una modification dana la mAthoda normala da filmaga aont indiquAa ci-daaaoua. Tha poa oft □ Colourad covara/ Couvartura da coulaur □ Covara damagad/ Couvartura andommagAa □ Covara raatorad and/or iaminatad/ Couvartura raataurAa at/ou palliculAa □ Covar titia miaaing/ La titra da couvartura manqua I I Colourad mapa/ D D D Cartaa gAographiquaa an coulaur Colourad ink (i.a. othar than blua or black)/ Encra da coulaur (i.a. autra qua biaua ou noira) □ Colourad plataa and/or illuatrationa/ Planchaa at/ou illuatrationa an coulaur Q Bound with othar matariai/ RalM avac d'autraa documanta D Tight binding may cauaa ahadowa or diatortion along intarior margin/ Laraiiura aarrAa paut cauaar da i'ombra ou da la diatortion la long da la marga IntAriaura Blank laavaa addad during raatoration may appaar within tha taxt. Whanavar poaaibia, thaaa hava baan omittad from filming/ 11 aa paut qua cartalnaa pagaa blanchaa ajoutAaa lora d'una raatauratlon apparaiaaant dana la taxta, mala, loraqua cala Atalt poaaibia, caa pagaa n'ont paa 4n§ f llmAaa. Additional commanta:/ Commantalraa aupplAmantairaa: D D D D D D D D Colourad pagaa/ Pagaa da coulaur Pagaa damagad/ Pagaa andommagAaa Pagaa raatorad and/or Iaminatad/ Pagaa raataurAaa at/ou paiiiculiaa Pagaa diacoiourad, atalnad or foxad/ Pagaa dAcolorAaa, tachatAaa ou piquAaa Pagaa datachad/ Pagaa dAtachAaa Showthrougli/ Tranaparanca Quality of print varias/ QualltA inigala da I'lmpraaaion Includaa aupplamantary matariai/ Comprand du matArial aupplimantaira Only adition avallabia/ Saula MItlon diaponlbia Pagaa wholly or partially obacurad by arrata alipa, tiaauaa, ate, hava baan rafllmad to anaura tha baat poaaibia imaga/ Laa pagaa totalamant ou partlaliamant obacurclaa par un fauiilat d'arrata, una palura, ate, ont At* fllmAaa i nouvaau da fapon A obtanir la malllaura imaga poaaibia. Ori( IMQ tha aiof oth nrai aior orH Tha ahal TIMI wM< Map difh antii baflt right raqu mati Thia itam ia fllmad at tha raduction ratio chackad balow/ Ca document aat filmA au taux da rAduetion IndiquA ci-daaaoua. 10X 14X 1IX 22X 2BX aox X 12X ItX »X a«x a2x The copy fllm«cl h«r« has bacn raproduocd thanka to tha ganaroalty of: Univtnity of Altorta Edmonton L'axamplaira filmi f ut raproduit grica i la gAfiAroaitA da: Univtnity of Albtrta Edmonton Tha imagaa appaaring hara ara tha baat quality poaaibia oonaMarlng tha condition and lagibillty of tha original copy and in icaaplng with tha - filming contract apadf loatlona. Original oopiaa in printad papar covara ara fHmad baginning with tha front oovar and anding on tha laat paga «with a printad or illuatratad impraa* •Ion. or tha back cover wwhan appropriato. All othar original copiaa ara fUmad baginning on tha firat paga with a printad or illuatratad impraa> •Ion. and anding on tha laat paga with a printad or illuatratad impraaaion. Tha laat racordad frama on aach microfleho •hall contain tha aymbol — ^ (moaning "CON- TINUED"), or tha symbol ▼ (moaning "END"), whicfiavar appilaa. Laa imagaa auivantaa ont 4tA raproduita^ avoc !• piua grand soin. compta tanu da la condition at da la nattat* da l'axamplaira film*, at w nonformitA'avac laa conditiona du contrat da filmaga. Laa aKamplairaa origlnaux dont la couvartura an papiar aat ImprimAa aont filmte an commandant par la pramiar plat at an tarminant aoit par la damlAra paga qui eomporta una amprointa d'impraaaion ou d'illuatration, soit par la tacond plat, aaion lo caa. Toua laa autraa axamplairas origlnaux aont filmte an commandant par la pramMra paga qui eomporta una ampralnta dimpraaaion ou d'illuatration at an tarminant par la damlMa paga qui eomporta una talia ampralnta. Un daa symbolaa auivanta apparattra sur la damiira imaga da ehaqua microfiche, salon la caa: la symbola — »• aignifia "A SUIVRE", la •ymbola ▼ aignifia "FIN". charta. ate., may ba fHmad at diffarant raduction ratioa. Thoaa too larga to bo antlraly included in ona axpoaura ara fllmad boglrming in tha uppar laft hand comar. laft to right and top to bottom, aa many framaa aa required. The following diagrama IHuatrate the method: Lea eartea. planchea. tableaux, etc., peuvent Atra f limAa A daa taux da rAduction diff Arents. LorM|ue le document eet trop grand pour Atra reproduit en un aeul clichA. il est f iimA A partir da Tangle aupArieur gauche, de gauche A droite, et de haut en bee. en prenent le nombre d'Imagae nAceaaaire. Lee diagrammee suivanta illuatrant la mAthode. 1 2 3 1 2 3 4 5 6 J» t ■■li ' I ill P i f! i i N< '%^c^ ReprinUdfrom the >Io.thlt Not.cbs of thb Rot.t. AsmoKOMiCAr. Soc.ktt Vol. LV. No. I, ' ' NOTE ON MR. STONE'S THEORY OF THE MEASURE OF TIME. BY Professor SIMON NEWCOMB. <.*^' II ■IS Wl t I; m >.! i m -\ ■ ml 111 I Nov. 1 894- Prof. Newcomh, Theory of the Measure of Time. 3 Note on Mr. Stone's Theory of the Measure of Time. By Professor Simon Newcomb. The discussion with Mr. Stone has now reached a stage w}iere nothing remains to be done on my part except to invite Mr. Stone's attention to the conclusions from his theory, as he states them in the May number of the Monthly Notices. A copy of Le Verrier's Tables du Soleil has been in my possession since the year 1859. If, with the tables in this book, I compute the sidereal time of mean moon on 1892, January 6, and thence the tabular right ascension of the Moon from Hansen's tables at the moment of its transit over the meridian of Oxford, on that date, I find a difference between the tabular and observed right ascension of i'"36. The result will be substantially the same if I use the older tables of Carlini. Mr. Stone maintains that this result is due to my failure to apply a certain correction to the numbers of Le Verrier's tables, which correction is not a function of anything contained in the tables, or of the epoch of any natu**al event, but of the date when a certain office, three thousand miles away, began to use the tables in computing the solar ephemeris. In his last note on the subject he gives precision to this conclusion by stating explicitly that if the office in question had not begun the use of the tables until 1892, the result would have been o''io, instead of i''36. The statement is still further strengthened by his answer to my second question, that o'"io would also have been the result if Carlini's tables had been continued to the present time in the Nautical Almanac Office, though, if I make the computation with Carlini's tables now, I shall get nearly i''36, the same as with Le Verrier's tables. It thus seems, according to Mr. Stone's theory, that the results which I now get from tables are different from what they would have been had a change of tables not been made in the Nautical Almanac Office. Bpottitwi'ivle (t Co. Prmltri, Mtic-urtei Square, London. (^Jl^^ 4