On Fri, 13 Jul 2007 09:31:04 -0400, "R.H." wrote:

They've all been answered correctly this week, check out the answer page for
more details:
http://pzphotosan178-x5.blogspot.com/

re the shot tower link on that page:
http://www.traphof.org/shot-towers-2...ers-page-1.htm
There's a bit missing from the history of the first shot tower, in
Bristol UK (I live nearby). Although that was indeed the first tower,
his development of the process began by him using the stairs inside the
house and extra height down into the cellars _beneath_ the house. The
house was built in "Redcliffe", a sandstone bluff overlooking the
harbour that had long been hollowed out into storage vaults and cellars
linked into the houses above.

The tower was demolished in the '60s for road-widening, but was replaced
by a new concrete tower. It's no longer in use, but is still standing.
http://en.wikipedia.org/wiki/Image:S...ristol.arp.jpg

In article ,
R.H. wrote:

Thanks for posting that, I changed the answer page to read "copper or
sheet-iron sieve", I found quite a few places on the web where they mention
copper being used so I kept that part. I would have replied sooner but I
was out of town this past weekend.

There's a ruin of a shot tower on the Audubon Society property in
Audubon, PA. The site was once a copper and lead mine, so I suspect
copper sieves were used there simply because the material was readily
available. I think those two metals are often found together.
--
There's no such thing as a free lunch, but certain accounting practices can
result in a fully-depreciated one.