Two bays of floor beams, one adjacent to wall and one internal bay, from the fourth floor level of the Quadrangle Storehouse at Sheerness Dockyard, overall size 340’ x 220’ with inner open court, five stories plus basement, designed by Edward Holl and John Rennie, built 1824-1829 and demolished in 1979. Consists of four main beams; twelve cross beams; four columns supporting the beams down to the third-floor level; two stub columns over columns one and two (there are none over columns three and four); stub main beams projecting past columns one and two on the fourth-floor level; two stub roof support beams over the main beam at the wall; one run of five York paving slabs to span between the main beams; as well as 18 accompanying bolts with nuts, and a sling

The importance of the Sheerness building lies in its structural system, not in the design of the building elements, it is an early structure in which a system of secondary beams (beams spanning between the main grids) is used in iron construction. Demolished in 1979, under the condition that some sections of the cast iron structure should be set aside for display purposes [Letter from Alan Butcher, 1978-05-06]