Workshop Technology
A rip saw

All of these
Is used for cutting along the grains of wood
Is a two man saw
Has a narrow blade with two wooden handles

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Workshop Technology
The purpose of a riser is to

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

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