[Phono-L] Class M

[Steve Andersen]

Mike,

Please send a picture of what you are talking about and maybe I can  
solve it. I have never owned a Class M but I deal with belted loads in  
a different capacity. I sell industrial electric motors and I have to  
deal with belted loads all the time.
Thanks,
Steve
On Oct 16, 2009, at 10:01 PM, Mike Tucker wrote:

> For the technical minded.
>
> I have occasionally wondered what was the purpose of the screw in  
> the topworks castings, under the mandrel, on Class M phonographs.
>
> Reading a copy of the 1893 "The Phonogram", I came across an article  
> on "How to work the Phonograph" which noted that "if the belt slips,  
> it needs tightening" and goes on "with a long-handled screwdriver  
> turn the projecting screw under the mandrel a few times, which will  
> press the body forward and tighten the belt.".
>
> The Class M's I have seen either have no screw in place or the screw  
> goes through the casting and doesn't connect to anything, so turning  
> the screw does precisely nothing.
>
> I must assume that there was some additional part which the screw  
> butted against to enable it to move the topworks, but I cannot see  
> how or where this would fit.
>
> Can anyone enlighten me?
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