Patten, B M <br/><br/>
A DEVICE FOR PROJECTING A SMALL SPOT OF LIGHT SUITABLE FOR EXPLORING PHOTOSENSITIVE AREAS.  [electronic resource] 

 -  Science (New York, N.Y.)  Jan 1915 
 - 141-2 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0036-8075 
<br/><br/><label>Standard No.: </label>10.1126/science.41.1047.141  doi