Triangular Hoist for Raising a Column
A screw-driven triangular frame and a geared jack to lift and set up a column upright
The sheet shows a screw-operated triangular hoisting frame and a tall geared apparatus for raising a column upright. A note explains that the triangular structure lets a screw be fixed at each corner to draw up the whole frame, and that the column must be braced with two boards as it is raised. A second inscription marks where the ropes are to be attached, beside the tall jack with its suspended weight.
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Screw-driven triangular hoisting frame
A tripod-like triangular frame carries a vertical screw at its apex. The note states that a screw can be attached at each corner to pull the entire structure, and that a column to be raised must first be armed with two boards.
Geared column-raising jack with counterweight
At the right stands a tall vertical apparatus fitted with a toothed wheel and rack at its base and a weight suspended near the top. An inscription beside it indicates the point for attaching the ropes used to hoist the load.