Workshop Technology
Loam sand is a mixture of

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

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Workshop Technology
The purpose of a riser is to

Deliver molten metal into the mould cavity
Feed the molten metal to the casting in order to compensate for the shrinkage
Act as a reservoir for the molten metal
Deliver the molten metal from pouring basin to gate

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