Drawing, Instrument for making the hand of an accurate clock by Robert Hooke Drawing of the instrument. This is an iteration of Hooke's universal joint and is made by connecting at specified angles several stiff steel wires which attach to a precise clock dial. The mechanical principle behind this device, Hooke states, could also be used for equations of time, resolving triangles, raising water, facilitating wheel-work and several other mechanical uses. Subject: Engineering 1667