Show meaze r I 1 ng meteors S speed p eed an interesting use has been found in astro astronomy for the bicycle wheel by fitting such buch a wheel with a aarlea series of opaque screens placed at regular intervals and then rotating it with the aid of at a small email motor at thettace thet the rate Tate of f it vm ova 80 30 to 60 50 turns turne in a minute before the cameras used to phot photograph ai meteors one investigator has fia succeeded in measuring inea suring the velocity of the meteors night hight the principle depends upon the interruptions pro ducer by the screens in tbt tb of light made upon the photographic plates by the flying meteor the velocity of the wheel la Is mown known at every instant by means of a cardno chro noi graphic record and the length of the interruptions indicates the speed of the meteor |