Walbottle Engine, Northumberland Plan and section shewing themanner of altering, adapting, and setting the 12 feet boiler of Walbottle engine so as to immediately communicate by the conveyance pipe with the cylinder Scale 1:36 Ink wash Signed 1776 The conveyance pipe for Walbottle engine Plan and sections, scale 1:12 ink wash Signed 1776 1776