A box of the shape of a barrel has been used, it being trunnioned at the sides. From Wordnik.com. [Scientific American Supplement, No. 643, April 28, 1888] Reference
Then a rectangular box has been used, trunnioned at opposite corners; but here the grave objection is that the concrete collects in the corners, and after a few turns it requires cleaning out, the material so sticking in the corners that it gets clogged up and ceases to mix. From Wordnik.com. [Scientific American Supplement, No. 643, April 28, 1888] Reference
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