The position of the sternpost screw.

The Great Eastern under construction. © National Maritime Museum, London

Repro ID: H1695

Description: The 36-ton cast-iron propeller of the 'Great Eastern' was carried on a shaft 150 feet long, weighing 60 tons. The position of the screw propeller is evident in this picture taken during the vessel's construction at Millwall.

Creator: Robert Howlett

Date: 1857