[Description of, and plans for, ventilating arrangements for ship 'Immortalite' / Admiralty. 1887. 12p. + 7 sheets (on roll with others), line drawings, scale 1/4" : 1'. Comprise ms. description; plan of main deck, sections, plans of upper deck and of platforms; profile; plan of protective deck, sections. See inv. no. 1997-1621/3 (MSL 146/3)] Description of, and plans for, ventilating arrangements for ship 'Immortalite' 1887