Thanks to everyone who has replied regarding stamps. To answer Mike's
question regarding rock drills, it is my understanding that the Climax
machine was found to be superior to Holman machines, at least of the same
type, and was remanufactured. I am also given to believe that all of the
original drawings had been destroyed by then and new ones had to be made up
by Holmans.
Pete Joseph
----- Original Message -----
From: "Mike Gill" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, July 10, 2008 9:27 PM
Subject: Two questions
> Pete,
>
> 1. The Company of Mine Adventurers (William Waller again) also had a
> stamp mill at one of its lead mines in Upper Swaledale, Yorkshire (where
> an area is still known as 'stamp mill field'). The gangue would have been
> barytes or calcite.
>
> Stamps were sometimes used to crush chats and/or black slags which were
> too hard for grinding by rollers.
>
> Presumably it would have been possible to adjust the loading, fall length
> and stroke frequency to avoid annihilating lead ore.
>
> 2. Modern rock drills are not my area, but I thought that Holmans had
> used the name Climax for one of its range (or continued producing Stephens
> and Son's drill).
>
> Regards,
>
>
> Mike Gill
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