The Magazine was expanded in various phases.  By 1902 the Magazine could hold a total of 4,168 barrels of Powder.

Work Dates included

20.7.1870 to 31.5.1871 Cost £1925 Strengthening

21.7.1881 to 31 .3.1882 Cost £460 Building an examination room

8.11.1882 to 5.1.1883 cost £140 Providing a traverse and raising walls

10.7.1886 to 31.3.1887 Cost £7 Providing rolling way

TNA WO 78/5275