systems of gears, shafts and wheels for lifting the flaps of a metal movable bridge mounted on two pillars of brickwork

apart arrangement axle bascule brickwork bridge canal circle consisting construction device double drawbridge drive engineering equipment europe flap flaps footbridge framework gear gearing gears installation iron lifting mechanism mechanisms metal mounted movable movement moving narrow old pillar pillars pinion raising retractable ripples river rod roll roller sash shaft shafts spindle steel system systems transfer transportation travel two water waves wheel wheels