Marchal-
     Your email to USGS:Ask-A-Geologist about how to obtain a long-period
seismograph was relayed to me by the USGS. I would have recommended that you check
out the Public Seismic Network (PSN) Redword City website 
but I have already seen you exhanging email with PSN members on the PSN listserver.
So I presume you have by now had your original questions answered. Good luck with
the Lehman seismograph that you are building. Do you know Kees Verbeek? (see below)

NAME:           Kees
Verbeek                                                            (12)
E-MAIL:         kverb@........
TOWN/CITY:      Eindhoven
STATE/PROV:     N-Brabant
COUNTRY:        Netherlands
LAT/LONG:       51.26 N 5.30 E

CH1:            Bosch mecanical (1908) 24- hours a day since 1994 (no filter just
damped (air)
                receive most quakes 5.5 and above home-made copy
DRUM:           mecanical rotating drum (smoked paper)
GND TYPE:       Deep soft soils
COMMENTS:       planning to make a portable seismograph (collecting info!)

-Edward

"Scott A. Minor" wrote:

> Dear Ed:
>         Thanks for helping me out on this!  Please respond to the inquirer ASAP
> (by this Friday at the latest), and please Cc: your answer to
> answers@................... and sminor@.........
>
> Thanks again,
> Scott
> _____________________________________
> Scott A. Minor
> U.S. Geological Survey
> National Cooperative Geologic Mapping Team
> Box 25046, MS 913
> Denver, CO  80225
>
> 303-236-0303 (office)
> 303-236-0214 (FAX)
> sminor@........
> _____________________________________
>
> -----Original Message-----
> From:   Marchal van Lare [SMTP:vanlare@...............
> Sent:   Tuesday, July 13, 1999 9:44 AM
> To:     Ask-A-Geologist
> Subject:        Surplus seismograph
>
> Hello,
>
> More than a year ago I started recording earthquakes with three 4.5 Hz Mark
> Products geophones. These geophones are only sensitive to local earthquake
> activity.
> The problem is, I am missing the large distant earthquakes.  To be able to
> detect the larger distant events I will need a long period seismograph.
> I tried to build my own device, but I couldn't get the right materials and
> I'm not a great technician.
> My question is, do you know of any source where I can buy a good working
> seismograph and/or parts? Or may be you know where I can find a source of
> old or used surplus long period seismographs?
> I am looking forward to hear from you.
> Best regards,
>
> Marchal van Lare
> -Nieuwvliet, The Netherlands

--
Edward Cranswick                Tel: 303-273-8609
US Geological Survey, MS 966    Fax: 303-273-8600
PO Box 25046, Federal Center    cranswick@........
Denver, CO 80225-0046  USA      E.M. Forster said, "Only connect".




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