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