[1-bag batch, box 12 inches deep.]
Proportion. Box for sand. Box for gravel.
----------- --------------- ----------------
_Feet._ _Feet._
1:1:2 1 by 1 1 by 2
1:1-1/2:3 1 by 1-1/2 1 by 3
1:2:4 1 by 2 2 by 2
1:2-1/2:5 1-1/4 by 2 2 by 2-1/2
1:3:5 1-1/2 by 2 2 by 2-1/2
1:3:6 1-1/2 by 2 2 by 3
A tight platform should be provided similar to that illustrated in Figure
12 upon which to mix the concrete. For mixing 1 or 2 bag batches a
platform 9 by 10 feet will serve.