About 1949 -1951 I worked for a timber company at
Marks Tey Essex. The firm had a standing order to
suply pit props and planks to the mining industry
The timber was oak or elm and cut into lengths of
about 4ft 6ins X 6ins X 2ins aprox? Branches of
the felled tree over 4ins dia and straight were
cut into props about 5ft? long
regards Pat
[log in to unmask]
22 Church road Tiptree Essex
--- David Summers <[log in to unmask]> wrote: > Having
in my time sawn a fair few while working on
> the hand-got face
> at Seghill in 1962 (after having seen the hind end
> of a pit pony too
> many times heading the wrong way over the points -
> which caused me to
> have to half unload the tub of props so that I could
> get it back on
> the way) - the face varied in height from a minimum
> of around 1 ft 8
> ins to around 5 ft. I believe that the props came
> in one standard
> length which we unloaded down the face before we
> started clearing it
> off. We measured the height we needed with an axe
> and our hands
> (this is where I learned that tip of thumb to back
> of hand was 6
> inches) and then cut to length. Wedges were then
> used to tighten the
> prop against the bar.
>
> Thinking about it a bit when I started -
> down at the tail end
> gate - the seam was about 5 ft and I seem to
> remember on occasion
> that I didn't have to saw the props so maybe they
> were sent in to the
> maximum face height. As far as girth was
> concerned they varied a
> bit but were on average around 6 inches or so.
>
> Dave
>
> >Anyone know anything about dimensions of wooden pit
> props? I assume that
> >well into C20th there wasn't any mandatory
> standardisation and, of course,
> >they'd have to be cut to size on site. But were
> there 'semi' standard
> >lengths? And I assume a relationship between length
> and diameter or girth?
> >Period that interests me is c.1900-1910 but
> grateful for info re any period
> >or for pointers thereto.
> >
> >Rgds,
> >Ken Smith.
>
> --
> David A. Summers
> Curators' Professor of Mining Engineering
> Adjunct Professor of Nuclear Engineering
> Director
> Rock Mechanics and Explosives Research Center
> University of Missouri-Rolla,
> Rolla, MO 65409-0810
>
> "fools talk, wise men listen." (a variant of Prov
> 12:23)
>
> phone: (573) 341 4314
> FAX: (573) 341 4368
>
> related web pages
> A growing selection of Dr. Summers' papers are being
> put on the Web
> and can be accessed through the Bibliography
> http://www.umr.edu/~rockmech/faculty/biography.html
>
> Rock Mechanics http://www.umr.edu/~rockmech/
> Waterjet Lab:
> http://www.umr.edu/~waterjet/
> UMR Stonehenge: http://www.umr.edu/~stonehen/
> Personal:
> http://www.umr.edu/~rockmech/data/Summers.html
> Mining Eng. http://www.umr.edu/~mining/
> Waterjet Assoc http://www.wjta.org/
> International Waterjet Society:
> http://www.iw.uni-hannover.de/iswjt/
> Next American Waterjet conference:
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