The correspondence from Neuss contains three drawings (one blueprint [potentially cyanotype] and two pencil drawings) showing modifications to Manley's litter.
1 folder - Physical Facet
Pencil on paper drawings: 150 x 298mm; 128 x 209mm
Blueprint: 117 x 347mm - Dimensions
Sir Herbert Charles Perrott, 6th baronet
Manley, Surgeon Major
Jos. Neuss