[JMS] National PW Dial Patent?

[Brian Page]

Hi James,

On my web site there is some material that might be of interest that I gathered in relation to my QST article back in 2011.  I have included the National PWD patent from 1936 as well as the 1934 U. S. patent of William George Harding for a micrometer dial (and a little back story).  

Here is the link: http://n4trb.com/AmateurRadio/National/Lamb/JamesLamb.htm  

Good luck with your story.  The PWD was truly a remarkable invention!

73,
Brian
N4TRB

-----Original Message----- 
From: JAMES HANLON 
Sent: Monday, August 18, 2014 8:19 PM 
To: AWA Group ; james_millen_society 
Subject: [JMS] National PW Dial Patent? 

Y'all,

For an article that I'm writing for Electric Radio Magazine, I'm trying to find out if there was ever a patent on the National PW dial used on the HRO receiver.  On the James Millen Society web site at
http://www.isquare.com/millen/bio_rem/merrill.html
there is an article with a picture that includes “original letters to and
from Millen and Clarence D. Tuska relating to the patent on the famous National
PW dial drive assembly, often refered to as the HRO dial.”  The person who assembled the items in the picture is Merrill W. Bancroft.  It was his display at the 2001 AWA Conference in Rochester, NY.  



I'd appreciate any information on the subject that anyone might be able to supply, including any leads to Mr. Bancroft if he is still with us and any ideas about the patent on the PW Dial drive.  

Thanks very much,

Jim Hanlon, W8KGI

       
______________________________________________________________
James_Millen_Society mailing list
Home: http://mailman.qth.net/mailman/listinfo/james_millen_society
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:James_Millen_Society at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html