[PRCo] Re: M11 accelerator

[Jim Holland]

Boris Cefer wrote:

>Time to come with my theory.
>
>If you want to show anything to student motormen, would you put it in a box
>to show as little as possible when it isn't necessary? It means there had to
>be a high voltage on that inverted accelerator! I am sure. But there was
>also the problem of cooling. That box could not allow cooling of resistor
>ribbons since it was too small. Therefore try to follow this THEORY: M11 had
>TWO "accelerators". The upper one (we could call it a mutinotch switch) was
>inverted together with its pilot motor to show the movements of the rotating
>arm with rollers pushing the fingers against bus bar. This was the most
>important thing to show, the rest had no value for students. This upper
>accelerator had not resistor ribbons. There was also an another accelerator
>under the floor (a set of resistors) which had neither rollers, fingers, bus
>bar and pilot motor; in fact, it was only a basic frame with insulating
>barrel (drum) and ring which carried a complete set of resistor ribbons.
>Each finger of the upper accelerator was connected with an appropriate
>resistor ribbon on the lower drum by means of a wire. Thus, 97 connecting
>wires.
>
Interesting thoughts!     So the upper roller would carry the current 
and route it to the lower drum where the resistors were located.     I 
watched the operation on the charter and remember some arcing of the 
rollers  --  DEFINITELY  remember the heat  --  Do Not remember it 
setting up for braking but do remember it reverting to  GO  when power 
pedal was released  --  don't remember anything about braking.

They could have modified the ventilation system to help air flow  --  
don't remember any vents in the box  --  would be natural to force air 
into the box and allow it to vent into the car  --  just open all the 
windows in the summer!

>Isn't it crazy? Surely, but it could work and it wasn't impossible. And if
>it was done this way, then I understand why PAAC didn't want the car.
>
The only reason  ({[pat]})  needed to get rid of the car is that it was 
a TrolleyCar, StreetCar, a hated vehicle by  ({[pat.]})     Remember 
that overhauled 1630 was reportedly rejected because it sported a Ten or 
Eleven trolley cowling which made it distinctly different from all the 
12s and forward on the property.     And 1630 had also been overhauled 
electrically // mechanically and was a stellar performer.     
({[pats]})  Loss when they so desperately needed equipment.

M11 hadn't been used for quite some time when  ({[pat]})  took over  --  
sitting on a stub track with pole down on west side of SHY down near the 
lower buildings.

>B
>
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Jim

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