The ladders are a fine representation of the now defunct technology of Curricle Ladders. The troop was equipped with his own design of Curricle gun carriage. Other historical English spellings include "corougle", "corracle", "curricle" and "coricle". On 29 November 1922 the Curricle Ladders re-appear at Headquarters&colon; awaiting repairs. Johnson's "pedestrian curricle" was patented in London in December 1818, becoming Britain's first bicycle. After being withdrawn from service, the Curricle Ladders were presented to the Powerhouse Museum.