| Show RECORDS POSITION OF STARS new astronomical instrument known as the blink microscope Is a valuable invention one of or the newest of astronomical instruments Is thy the blink microscope the principle involved lavol M la is similar to that of the loov ins picture machine I 1 in the lie latter the falln awl consists of a series of pictures pic turis ench each a little different from its predecessor if these are in rapid succession the series 1 is aued into one picture in which the succeeding differences appear as motion the blink microscope enables one to commire a photograph of a portion of the eitai travas ens alth another ane of th the e gume region taken several ears ellys later an Ingin lus contrivance brings bring s first oue ole then the tile other plate nto into view in r nold id bucce succession aslon if in the inter interval 0 between the two exposures po postures aures a star in the region reidon haa changed its position tion appreciably it will appear to move conj can be detected at once onee formerly Y it aus Is necessary ec essary to jue measure asure carefully the positions of all the stars on both plates in order to detect delarge those with it large lame proper motions sometimes llad ld I 1 runaway such stare stars are stars |
