Re: How to decouple scope
- From: john.pazmino@xxxxxxxxxxxx (JOHN PAZMINO)
- Date: Sat, 15 Jul 2006 23:37:24 -0400
D > Subject: Re: How to decouple scope form ground vibrations ?
D > From: "Donal" <donal@xxxxxxxxxxxxxx>
D > Date: Mon, 10 Jul 2006 23:30:17 +0100
D > > the concrete footings, but am not sure how this might work.
D >
D > I've heard that sand is very good for preventing the transmission of
D > vibrations.
D >
D > I (currently) intend to place my pier in a cubic metre of concrete, with
D > about 2 inches of sand below and around it.
The observatory at Brooklyn College was built into a campus
buidling only fourty or so meters from a busy electric rail line.
Freight trains coursed by several times a day. (The line since has
deteriorated and only one or two trains a day pass thru. The electric
was removed, too.)
However, the terrain at the college is alluvial sand and gravels
from the glaciers. They absorbed the vibrations amazingly well. The
scope, on the roof of the building, quivered only slightly, We could
continue examinig, say, Mars under high power. Photography had to stop
until the train passed by.
To accommodate photography, this was long before didtal imaging,
we obtained from the railroad a timetable for this line and planned
out work around it.
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