> I suspect size differences would be due to not
> using fixed sized molds but rather using wooden
> forms with separate pieces of wood. The wood
> pieces would not necessarily be the same size each
> time. Especially since the wood pieces that would
> hold the slurry would wear out over time and would
> be replaced over time.
> Older wooden forms would shrink with time. The
> impact is different based on the direction. If a
> board is cut such that the length of the board is
> oriented towards the vertical growth of the tree,
> shrinkage is less than 1%. But if the length of
> the board is oriented towards the width of the
> tree, the shrinkage may range from 2% to 12%. If
> the size of the block is say 4 feet, and the
> boards were cut across the width of the tree,
> those boards would over time show quite a bit of
> Now in a modern lumber mill, boards are cut down
> the log, which orients towards the vertical of the
> tree. But suppose you are cutting a board by hand
> directly from a tree stump. In that case, the
> boards are cut across the width of the tree, and
> these boards would show an average of 5% to 10%
> shrinkage over time. In this situation, if the
> boards are used for several years, the wood
> shrinkage of the planks used for forms would
> result in noticeably different block sizes.
Hello Race Jackson:
Why would “cut” wooden forms shrink “over time”, when the forms would have been in constant contact with wet “slurry” throughout the form’s functional life-cycle?
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