SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 'J2, NO. 12, PL. 1 



Photograph l.\- .\. I.arsen of lightning flash between clouds near Chicago on May 2y. 

 Camera moving about a vertical axis. Speed, one revolution in 5 seconds. 



iyo8. 



Fh(jtugraph by K. J. Spickerman of lightning tlash between clouils near Chicago 

 July 17, 190S. Camera held stationary in the lap of the operator. 



