All metal, fit for being amassed and disassembled easily.A vast metal trolley with removeable barrel shaped weights isfitted with wheels which keep running with next to no erosion on a track of two steel bars 150 cm long.The rail poles are held inheavy clasps which arefitted in two vertical bars, mounted on cast press feet. Thesteel vibrator is fitted to one of the vertical poles andfrictionless pulley to the next. The unit is competent to verifythe law under various conditions. Finish with rope, scalepan, brush and ink.

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