Marv wrote:

Which is a consequence of an even weirder fact - a mass inside a
uniform sphere of finite thickness will experience no net attractive
force from the sphere. Gravity decreases linearly as you penetrate
into the earth.

Hi Marv,

I got the center of the earth thing as soon as it was pointed out. I don't seem to be
able to grok your paragraph above.

Btw, you the Marv with all the neat metalworking programs? If so, thanks for putting that
stuff out. Still have not got around to porting to my palm pda. Sure would like to move
the gage block stack one first.

Wes