. JUPITEiv, lUili-iL.^kV 17, 1906. From a drawing by the Rev- James Baikie, Edinburgh' similar result, viz. that the speed of light was ten thousand times that of the earth in its orbit, that Roemer's theory was accepted and incorporated into science. For it was perceived that the two observa- tions mutually sustained each other, although up to that time no terrestrial observation had been sufficiently delicate to enable the speed of light to be directly measured by experimenting with artificial sources on the earth's surface. This was done, as everyone now knows, by the great French physicist


. JUPITEiv, lUili-iL.^kV 17, 1906. From a drawing by the Rev- James Baikie, Edinburgh' similar result, viz. that the speed of light was ten thousand times that of the earth in its orbit, that Roemer's theory was accepted and incorporated into science. For it was perceived that the two observa- tions mutually sustained each other, although up to that time no terrestrial observation had been sufficiently delicate to enable the speed of light to be directly measured by experimenting with artificial sources on the earth's surface. This was done, as everyone now knows, by the great French physicist Fizeau, in 1849, and afterwards confirmed beyond the shadow of a doubt by Foucault ; so that the speed with which the Ether is able to transmit waves became the familiar and commonplace fact which it is to-day. A Popular Misconception I began this article by saying that there was much misunderstanding about the behaviour of Jupiter's


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