Crum nitrogen tube
Hugo Schiff's nitrometer
Knop azotometer
Hugo Schiff's nitrometer with clamp
Glass pipette used with Lunge nitrometer
Lunge nitrometer with stopcock with oblique bores
Staedel's Nitrogen Apparatus, London, C. 1885.
circa 1885
Muller nitrometer with stand for Dumas combustion method of organic analysis made by Camlab Ltd. Cambridge
1951-1960