From: terrell.michael.a@gmail.com   
      
   On Sunday, January 26, 2020 at 4:00:53 PM UTC-5, George Herold wrote:   
   > 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.)    
      
   Yes, 25Hz was common a century ago, it was used for large motors to get better   
   torque at  low speeds. It was common in mining towns, since it was needed for   
   the mining equipment. It wasn't produced by military style mobile or portable   
   generators. The    
   Sinewave generators had frequency meters for accurate testing of AC line   
   components. It was common to buy radios, clocks and kitchen appliances made   
   for 25Hz for the areas that used it. Those radios till show up as antiques,   
   because they also worked on    
   60Hz. The same radio was often built in two models, with the regular 60Hz   
   transformer, or the much larger 25Hz version that cost more. The Military used   
   60Hz for land based generators and 400Hz for aircraft to reduce the size and   
   weight of motors and    
   transformers.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)