Gillingham, Harrold Edgar,  1864- <br/><br/>
Some early Philadelphia instrument makers. 

 - 22 pages :  illustrations, plates 
<br/><br/> Reprint from the Pennsylvania magazine of history and biography, October 1927. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Scientific apparatus and instruments.<br/>Mathematical instruments.<br/>Industries--Pennsylvania--Philadelphia.<br/>Industries.<br/>Mathematical instruments.<br/>Scientific apparatus and instruments.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Pennsylvania--Philadelphia.
<br/><br/><label>Subjects--Index Terms: </label>History Switzerland Regional Scientific instrument