ChrisAtUpw@....... wrote:
> In a message dated 2006/10/03, tchannel@.............. writes:


>>2. Again the solder, is non magnetic is this important as I see many things 
>>use as mass including iron?
> 
> 
>        I don't use any magnetic materials on the boom 'in principle'. You 
> won't know for sure what is a magnetic interaction and what is seismic. If I am 
> taking the time and effort to build a seismometer, avoiding obvious problems 
> just makes good sense. Like put the pickup coil on the arm and the magnets on 
> the baseplate! 

    This makes good sense for eliminating magnetic effects on the boom, 
but you then have electric connections to something on the boom. How do 
you do connect to the coil and minimize friction and "spring"-type 
interference to the boom from the connecting wires?
    I have my own ideas in this area that I think are good, but I'd like 
to hear what others do for this.

>        Regards,
> 
>        Chris Chapman
> 

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