National Physical Laboratory <br/><br/>
Photometry of telescopes and binoculars 

 -  1955 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>59294 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Radiation
<br/><br/><label>Dewey Class. No.: </label>C5:28e, J5           CS