Details of exhibit

Exhibition:
1915 Sixtieth Annual Exhibition of the Royal Photographic Society of Great Britain  
Exhibit title:
Discovery of variable stars by superposing a negative on a positive of a different date.  
Exhibitor:
Ernest C. Pickering 
Section:
III. Scientific and Technical Photographs, &c. 
Group Title:
189 to 194 Photographs illustrating methods of finding Variable Stars employed at the Harvard College Observatory, which have r 
Exhibit No.:
5 
Description:
Some of the variables are marked by arrows. 
Exhibit type:
Photographic equipment and supplies 
Process:
[Not Listed] () 
Award:
none