7.-190,000 MILES A SECOND.

Grey River Argus, 11 June 1904, Page 4 (Supplement)

7.-190,000 MILES A SECOND.

I™Z. * oOcr^ r rot. ot kgK however, i s wel' known, for it, has been measured by astronomical observations, as well aY by physicarexpenments. In round nuniOcrs, light moves at the rate of 19u,u00 miles a second. J l9O n£Wi to hnagine J Buch a ***** as 190,000 miles a second; but it be- • ITtl, "OT^kawble it we recollect VaLv f he Idl1 dl ? tance between London and Edinburgh ISj roughly, four hundred and that Stakes an express train liM me?™ -° °? Ver &* distance. Now, 190,000 miles is exactly 475 times the &f tone « between London and Edin! S^^" 1 ? 6 , 88 ? o™ll^0 ™ 11^ will travel the distance which it would take a train 4/0 journeys of ten horn-si to accomplish, so that, if it were to do the double jourm e !f G i, Ver l - day ' £ w ? uW ■"» ov <* seven months doing what light does in a secEveryone knows that ordinarY li^fat does not consist of one colour, but of "all the colours of the spectrum— red. yellow, orange, green, blue, indigo, and violet aU being mixed together to produce .white. Everyone knows, too, that in it ocean _ some waves are longer than r v?* m J?' h \ B&me ,t hin g happens with light. The shortest light waves are those at the extreme end of the violet side of the spectrum, while the longest waves are those at the extreme red.