[GreenKeys] "Mystery" M28D

[Randy or Sherry Guttery]

Duncan M. Brown wrote:
>  
> The AWA Museum has been offered a Teletype model "28D".  In looking on the
> Internet for info on a "D" model (never heard of it before), the only place
> I found any detail about it is on Nick's Virhistory site
> http://www.virhistory.com/ham/rtty-05.htm  where he asks about it.  
>  
> Nick has pictures & differences on the above site, so I won't repeat it
> here.  Anyone Know what it's modifications were for??

No, but I do have a couple of observations - he notes the keyboard drive 
gear is 26 teeth vs. 20 - As some may have read - I just asked about a 
strange main-shaft gear that was 66 teeth vs. 60 - (which Jerry Murphy 
identified as the input (driven) gear for a 7.00 machine (vs. 7.42)) and 
the keyboard drive gear common with that is indeed a 66 tooth gear. 
Likely then, that this mod is for a military machine (since they seemed 
to be the primary 7.00 vs. 7.42 code customer).

Considering the mod on the spacing wheel appears to be "indexed" roughly 
in "spaces" - and tabs can be set at various horizontal locations which 
operate a lever - it looks suspiciously like a horizontal tabbing unit.

just my .02...
-- 
randy guttery

A Tender Tale - a page dedicated to those Ships and Crews
so vital to the United States Silent Service:
http://tendertale.com