r i r IMAGE EVALUATION TEST TARGET (MT-3) CIHM/ICMH Microfiche Series. CIHIVI/ICIVIH Collection de microfiches. Canadian Institute for Historical Microreproductlons / Institut Canadian de microreproductions historiques •*«.' Technical and Bibliographic Notes/Notes techniques et 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 significantly change the usual rn«Thod of filming, are checked below. L'Institut a microfilm6 le meilleur exemplaire qu'il lui a 6X6 possible de se procurer. Les details de cet exemplaire qui sont peut-etre uniques du point de vue bibliographique, qui peuvent modifier une image reproduite, ou qui peuvent exiger une modification dans la m^thode normale de filmage sont indiqu^s cl-dessous. 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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 dtra film6s d des taux de reduction diffdrents. Lorsque le document est trop grand pour dtre reproduit en un seul clichd, il est film6 d partir de Tangle sup6rieur gauche, de gauche d droite, et de haut en bas, en prenant le nombre d'images ndcessaire. Les diagrammes suivants illustrent la mdthode. errata to ! pelure, Dn d D 32X I 1 2 3 1 2 3 4 6 ■ J»aaia s il « i» Mt . i» t 1 Reprinted from the Monthly Noticbs of the Royal Astronomical Socibty, Vol. LIV. Xo. 7. TWO QUESTIONS ON MR. STONE'S PROPOSED CORRECTION TO THE MEASURE OF TIME. BY Professor SIMON NEWCOMB. 4oS P^'f\f' Newcomh, On Mr S/one's Correction etc. Liv. 7. Two Questions on Mr. Stone's Proposed Correction to the Measure of Time. By Professor Siuioii Newcomb. From Mr. Stone's note on p. 288 of t}ie Monthly Notices for March it would seem tliat he has not carefully read the short Paper to which his note alludes. This Paper contains no attempt to disprove Mr. Stone's views, nor were any quantities in his theory neglected ; on the cc itrary, the Paper was principally an attempt to apply his theory, as he states it, to the special case of the transit of the Moon observed at Oxford on 1892 January 6, on the supposition that the use of Le Verrier's tables, and the consequent introduction of the new measure of time, commenced in 1892. An inconsistency was found, and Mr. Stone was asked to explain it. He says nothing about this observation, and gives no explanation of the inconsistency, I therefore beg that Mr. Stone will answer these two questions : — (i) What would have been the tabular error of Hansen's tables of the Moon given by the transit observed at Oxford on 1892 January 6, and printed on p. 4 of the Monthly Notices for the present session, if Carlini's tables of the Sun had been continued in use in the Nautical Almanac until the present time ? (2) What would have been the tabular error given by the same observation had Carlini's tables been continued until the end of 1 89 1 and Le Verrier's introduced for the first time in 1892? Either Mr. Stone can answer these very simple questions or he cannot. If he can answer them, I respectfully submit that it is only just to himself that he should do so, giving the numerical computation in each of the two cases fully enough to be under- stood, comparing it with the actual computation on p. 4, and showing how the result follows from his theory. If he cannot answer them, nothing more need be said. Spollisuo nie it Co. J'rinUn, Ai-ir ilie.l iiquan, Lmid m. OCr IS 1809 LIV, 7. ft-. ' 'g^ g ^ j L ' -^ !?*'!"'^'^^