From: "Richard F.L.R. Snashall" 
To:  atm{at}shore.net
Reply-To: "Richard F.L.R. Snashall" 




Bill T. wrote:
>
>
>> I need to get some dental plaster from a local dentist to make the base
>> of the pitch lap. The mirror is 10” - how much plaster should I ask for?
>
>
> Here's a formula for estimating the amount of dry Hydrostone needed for
> a given tool.  Dental plaster is probably similar.
>
> weight_of _dry_Hydrostone = desired_tool_thickness * surface_area * 0.05
>

Is that 0.05 lbs/in^3 or 0.05 ktons/parsec^3???

> sufrace_area = radius * radius * 3.14.
>
> Bill T.
>


--
Rick S.
http://users.rcn.com/rflrs

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