HAMILTON SCIENTIFIC ASSOCIATION. 139 



Uses of Photography ii\ Astronomy 



By Re-v. D, B. Marsh, ScD., F.R,A,S, 



Synopsis 



The lecturer gave a brief outline of the history of photog- 

 raphy in astronomy, tracing it to the present. Then he threw on 

 the screen some recent work done by the various large observa- 

 tories throughout the world. 



The effort of the lecturer showed that by photography in 

 astronomy 



1. Comparisons could be made. 



2. Transient conditions were rendered permanent. 



3. Correct records of conditions were obtained. 



4. Photography a great aid to new discovery. 



5. Orbits were determined with more accuracy. 



6. Spectroscopic study much extended. 



