sentences:  By or soon after the appointment of Baron George Anson as First Lord of the Admiralty in 1751, the system of establishments that covered the design of British warships was abandoned, and with the appointment of Thomas Slade and William Bately as joint holders of the post of Surveyor of the Navy in 1755, new principles governed the composition of the battle fleet.The Navy Board stopped building any further three-decker 80-gun ships.Production of the 70-gun and 60-gun ships also ceased.