From: gherold@teachspin.com   
      
   On Saturday, January 25, 2020 at 7:04:53 AM UTC-5, Michael Terrell wrote:   
   > On Friday, January 24, 2020 at 8:07:41 AM UTC-5, default wrote:   
   > >   
   > > On Thu, 16 Jan 2020 10:42:28 -0800 (PST), Michael Terrell wrote:   
   > > >   
   > > >The TS-382 series were military versions in transit cases. They had a   
   vibration reed frequency meter to display 60 Hz and 400Hz. The insides were   
   protected for Jungle use, and the one I have, (TS-382/F)has heat strips to   
   drive moisture out of the    
   cabinet.   
   > >    
   > > I remember those from navy ET-A school.  They had two resonant reeds,   
   > > for 40 HZ and 400 HZ.   
   >    
   >    
   > I've never seen one for 40 Hz. Only 60Hz or 60Hz and 400Hz.   
      
   Niagara Falls use to send out 25 Hz power.. (maybe three phase,   
   but I couldn't find a reference.)    
      
   George H.   
      
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