## PSN-L Email List Message

Subject: RE: Modified sound card and datalogging and geophones
From: "Doug Crice" dcrice@............
Date: Thu, 21 Jul 2005 16:47:11 -0700

```A sledgehammer is operated by swinging it through about a 250 degree =
arc,
presumably by a muscular associate.  If you were to replace it with a =
weight
drop, you would need to drop it many meters to approximate this amount =
of
energy. Thus, your weight needs to be accelerated somehow.  There are =
units
that attach to vehicles with large rubber bands.  They are cocked by
electric or hydraulic devices. See photos on
http://www.giscogeo.com/pages/giscosei.html=20

=20

We would like to make a significant improvement in energy output. You =
could
make a better hammer and  plate, but probably not twice as good.

=20

I have considered flywheel operated devices. You could spin up a =
flywheel
with a battery operated drill and then couple the energy into the ground
somehow, though there are strange forces going in strange directions =
when
you suddenly stop a spinning flywheel.

=20

Doug Crice          http://www.geostuff.com

Wireless Seismic            http://www.wirelessSeismic.com

12996 Somerset Drive                phone 1-530-274-4445

Grass Valley,  CA  95945  USA    fax 1-530-274-4446

=20

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of ChrisAtUpw@.......
Sent: Thursday, July 21, 2005 4:22 PM
To: psn-l@..............
Subject: Re: Modified sound card and datalogging and geophones

=20

In a message dated 22/07/2005, dcrice@............ writes:

7) And last but not least, it needs to work better than a sledgehammer =
used
with a seismograph that can stack multiple impacts.

Hi Doug,

=20

This may be a bit ''off the wall'', but there is another way of =
looking
at the problem.=20

=20

Can we design a better type of sledge hammer + plate / falling =
weight?=20

=20

Regards,

=20

Chris Chapman

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A sledgehammer =
is
operated by swinging it through about a 250 degree arc, presumably by a
muscular associate.  If you were to replace it with a weight drop, =
you
would need to drop it many meters to approximate this amount of energy. =
Thus,
your weight needs to be accelerated somehow.  There are units that =
attach
to vehicles with large rubber bands.  They are cocked by electric =
or hydraulic
devices. See photos on http://www.giscogeo.=
com/pages/giscosei.html

We would like to make a significant =
improvement
in energy output. You could make a better hammer and  plate, but =
probably not twice =
as good.

I have considered flywheel =
operated
devices. You could spin up a flywheel with a battery operated drill and =
then
couple the energy into the ground somehow, though there are strange =
forces
going in strange directions when you suddenly stop a spinning =
flywheel.

Doug Crice      =
;    http://www.geostuff.com

Wireless
Seismic           =
http://www.wirelessSeismic.com

12996 Somerset
Drive           &n=
bsp;
phone 1-530-274-4445

Grass Valley,  CA  =
95945
USA    fax 1-530-274-4446

-----Original =
Message-----
From: =
psn-l-request@..............
[mailto:psn-l-request@............... On
Behalf Of ChrisAtUpw@.......
Sent: Thursday, July 21, =
2005 4:22
PM
To: =
psn-l@..............
Subject: Re: Modified =
sound card
and datalogging and geophones

In a
message dated 22/07/2005, dcrice@............ writes:

7) And
last but not least, it needs to work better than a sledgehammer used
with a seismograph that can stack multiple impacts.

Hi =
Doug,

&nbs=
p; This
may be a bit ''off the wall'', but there is another way of looking at =
the
problem.

&nbs=
p; Can
we design a better type of sledge hammer + plate / falling weight? =

&nbs=
p; Regards,

&nbs=
p; Chris
Chapman

```