Workshop Technology
Loam sand is a mixture of

30% sand and 70% clay
70% sand and 30% clay
90% sand and 10% clay
50% sand and 50% clay

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Workshop Technology
Riddle is used for

Cleaning the moulding sand
Smoothing and cleaning out depressions in the mould
Moistening the sand around the edge before removing pattern
Reinforcement of sand in the top part of moulding box

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