1909 · High-Pressure Ammonia Synthesis · Work 1286 of 1,871
A chemistry laboratory in Karlsruhe on a warm summer night, lit by mantle lamps on brass brackets, on a pale wooden board a small high-pressure apparatus of bright steel, columns on round black cast feet, at the left a tall steel cylinder with a wide funnel collar and a small tap below, under the tap a slender glass tube holding clear colourless drops, in the middle a steel body with a round white pressure gauge, beneath it thin curved pipe loops on a tripod, two pipe manifolds with T-handles at the front, the gauge with a blank white face and plain marks, a hand in a dark sleeve turning a T-handle.