Gutzeit apparatus for determining arsenic

Tyrer-Marsh arsenic apparatus

Dowzard's arsenic apparatus

Kirkley-Gutzeit arsenic apparatus

Tyrer-Marsh arsenic apparatus

Marsh's arsenic apparatus on wooden stand

Dowzard's arsenic apparatus (Chem. News 4.7.1902)

1902

Dixon Mann's arsenic apparatus

Electrolytic arsenic apparatus with platinum cathode (dummy)

Standard pattern arsenic apparatus with burner

Electrolytic arsenic apparatus with amalgamated lead cathode