Explanatory notes
… and water gas generators may be adapted for burning many kinds of solid fuel (e.g., coal, coke, charcoal, wood, … be cleaned of impurities such as dust, tars, sulphurous compounds, etc., and sometimes reheated or cooled. For this … fitted with purifiers (comprising perforated cones, coke beds, scrubbers, etc.), coolers, dryers, reheaters, etc. …