PSN-L Email List Message

Subject: Re: Gulf Of California on a seismic Detector
From: ChrisAtUpw@.......
Date: Wed, 4 Jan 2006 11:25:14 EST


In a message dated 04/01/2006, ian@........... writes:

Hi,
thanks for the reply, I'm still working through it!  In the  meantime, I 
don't have any good pictures but here is a drawing of the housing  that I just 
quickly sketched: _http://www.iasmith.com/housing.jpg_ 
(http://www.iasmith.com/housing.jpg)   . 

I have no heater.  I had hoped to avoid one but sounds  like I need to 
consider it.
Hi Ian,
 
    It is not very easy to seal the open top of a box  like this. You might 
be able to do it with foam strip around the edge or the  bottom of the 
thermawall cavity board plug.
 

    I would be inclined to get a big sheet of polythene  (~9ft square damp 
proof membrane?) from a builder's merchant, drape it over the  top and to the 
ground all around the box, fold in the corners and secure them  with tape or 
string. This is in place of the multi layer paper sheet.  Alternatively, you 
could use gaffer tape either to seal the paper to the  sides of the box, or tape 
the existing top sheet to a surrounding paper wrap.  Then put the sarking board 
lid on the box.
 
    I suspect that you will need some form of heating  inside the case. You 
will probably need at least 10 watts. Power resistors are  preferable to 
filament bulbs, which tend to attract insects. Can you 'acquire' a  large cardboard 
box to put over the top of the existing case?
 
    Regards,
 
    Chris Chapman





In a message dated 04/01/2006, ian@........... writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000=20 size=3D2>Hi,
thanks for the reply, I'm still working through it! =20= In the=20 meantime, I don't have any good pictures but here is a drawing of the hous= ing=20 that I just quickly sketched: http://www.iasmith.com/housing= ..jpg=20 . 

I have no heater.  I had hoped to avoid one but sounds= =20 like I need to consider it.
Hi Ian,
 
    It is not very easy to seal the open top of a b= ox=20 like this. You might be able to do it with foam strip around the edge or the= =20 bottom of the thermawall cavity board plug.
 
    I would be inclined to get a big sheet of polyt= hene=20 (~9ft square damp proof membrane?) from a builder's merchant, drape it over=20= the=20 top and to the ground all around the box, fold in the corners and secure the= m=20 with tape or string. This is in place of the multi layer paper sheet.=20 Alternatively, you could use gaffer tape either to seal the paper to th= e=20 sides of the box, or tape the existing top sheet to a surrounding paper wrap= ..=20 Then put the sarking board lid on the box.
 
    I suspect that you will need some form of heati= ng=20 inside the case. You will probably need at least 10 watts. Power resistors a= re=20 preferable to filament bulbs, which tend to attract insects. Can you 'acquir= e' a=20 large cardboard box to put over the top of the existing case?
 
    Regards,
 
    Chris Chapman

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