1. The invention concerns a tower crane comprising a tower consisting of at least one tower component, in particular a lattice part and construction guying with at least one stay pole for horizontally anchoring the tower on a construction.

2. Later improvements involved a “guying rubber,” which helped flip the vane over when the boat stopped heeling, and the “Liverpool boy,” which held the jib on the old tack until it Backwinded, thereby pushing the bow over more smartly.