Never, ever give up!  Old seismometers are something to be preserved and 
used.
Dick

JAMES ALLEN wrote:
> Dick, Meredith, Chris:  I would like to thank you for the help that 
> you provided regarding the 201 Sprengnether seis.  I had been trying 
> off and on for over a year to get it to oscillate as described in the 
> manual with no luck.  Because of you guys thread I found out that it 
> would not work because someone had replaced the original hinge with 
> inappropriate steel wire.  Upon replacing the wire with shim brass 
> like described in Dicks email, it centers and oscillates like 
> described in the manual.  I used brass until I can find a piece of 
> phosporus bronze which I understand would even be better. Anyway, I 
> really appreciate you guys help since I was about to give up and put 
> it on Ebay.
> James Allen
> ----- Original Message ----- From: "Dick Webb" 
> To: 
> Sent: Wednesday, August 20, 2008 2:57 PM
> Subject: Re: SPRENGNETHER 201 LONG PERIOD VERTICAL SEISMOMETER
>
>
>> Sorry, that was 0.4 to 0.5 mm thick.  I only have a non digital old 
>> time mechanical micrometer.
>> Dick
>>
>> Dick Webb wrote:
>>> The dimensions are 0.05 mm thick by 6.3 mm wide and 4.5 cm long.  
>>> Also, there are three holes at each end, the space between the 
>>> central holes is 2.3 cm.  It looks kind of like this:             
>>> 000          000
>>>
>>> Hope this helps.
>>> Dick
>>>
>>> meredith lamb wrote:
>>>> Hi Chris,
>>>>
>>>> Excellent!
>>>>
>>>> The two separate masses weigh a total of 20 pounds.  The absolute 
>>>> maximum width of the spring allowed within the
>>>> clamp is 0.311"; it could obviously contain a smaller width ~ 
>>>> 0.25", for much easier insertion/replacement.
>>>>
>>>> As a possible material prelude; I do have 0.007", and 0.014" thick 
>>>> phosphor bronze shim roll stock.  I also have
>>>> 0.010" thick blue tempered hardened steel spring shim roll stock.  
>>>> All old but never used.  All would need cutting
>>>> down and cut edge filing deburring to fit the flat clamp size 
>>>> firmly/easily; all the spring widths are more than 0.311".
>>>> Take care, Meredith
>>>>
>>>>
>>>>
>>>>
>>>> On Wed, Aug 20, 2008 at 8:17 AM, >>> > wrote:
>>>>
>>>>     In a message dated 2008/08/20, dwebb002@.............
>>>>      writes:
>>>>
>>>>>     I have a few pieces of the original and will measure the width 
>>>>> and
>>>>>     thickness as soon as I find a micrometer.  I can attest that they
>>>>>     are
>>>>>     rather fragile.  I don't know the composition but they have a 
>>>>> brassy
>>>>>     appearance.
>>>>>     Dick
>>>>
>>>>
>>>>     Hi Dick, James , Meredith,
>>>>
>>>>            If you can give me the seismic mass and the maximum width
>>>>     of the clamp strip, we can work out the thickness required quite
>>>>     easily. The wire was almost certainly a repair.
>>>>            It is very unlikely to be brass, but it could well be
>>>>     bronze or phosphor bronze strip. You might also consider a SS
>>>>     replacement?
>>>>
>>>>            Regards,
>>>>
>>>>            Chris Chapman
>>>>
>>>
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>
>
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