- Nelson's Monument
- Netherton, Naesmyths of
- Nicholas, Emperor
- Nismes, architecture at
- Norman architecture
- Nuremberg
- Nut-cutting machine
- Oxford, visit to
- Paddle-shaft, Great Britain
- Paris, visits to
- Parry. Sir E.,
- Partners
- Patents
- Patricroft
- Patterson, James
- Peel, Sir R., works
- Pencil drawings
- Petersburg, St.,
- Photography
- Pico, lunar mountain
- Pile-driver, steam