Diagonal machine. A small square wooden frame, about a foot wide. A slightly smaller frame slides horizontally out. A brass ball on a string and attached to a pulley on the smaller frame moves diagonally upwards as the frame is slid horizontally.

ABDNP:201403a

Demonstration originated by James Ferguson to illustrate that the sum of compound motions at right angles produce a diagonal displacement. Wooden frame sliding element holding with brass ball on rod that slides up rod as frame is moved sideways. Disk "Univ. Abdn. Nat. Phil."

1780-1790

wood, brass, string
255 mm wide, 75 mm deep, height 225 mm

Patrick Copland

Physical Object