Machine for hoisting roof and floor beams
A tall lifting apparatus drawn upside-down, for setting beams on floors and roofs
A pocket-notebook leaf — drawn upside-down relative to the two lines of writing at the top — showing a tall machine for hoisting and positioning heavy timber beams. A frame or platform at the top gathers a bundle of long members that converge downward to a base with crossed beams and a roller or pulley at the foot. The note explains its use: raising and placing beams onto the floors of houses and onto their roofs.
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Beam-hoisting apparatus
The leaf is filled by a pen drawing of a hoisting machine shown inverted: a rectangular frame or platform at the top from which many long converging members run down to a base of crossed beams, ending in a roller or pulley at the foot. The converging rods act to raise a load along the central axis, where an arrow marks the direction of pull. The design is worked out in some detail.
Setting beams on floors and roofs
The accompanying note gives the machine's purpose: to raise and set heavy beams in place on the floors of houses and on their roofs. It is thus a device for construction work, moving large timbers into position on a building.