Furnace and Wheel Marked 'All Hot' and 'Half Hot'
A large wheel in a vaulted chamber and a furnace blasting flame, its interior labelled by degree of heat
The sheet pairs two apparatus drawings. At the right a furnace roars with flame driven from a conical nozzle or bellows, its body annotated to distinguish where it is 'all hot' from where it is only 'half hot', mapping the temperature zones of the fire. At the left a tall segmented wheel stands in a vaulted, stepped chamber beside a low walled channel, drawn in perspective as a mill or driven wheel. A figure-number '18' is inscribed between the two; no further text is transcribed.
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Heat zones of the furnace: 'all hot' and 'half hot'
The furnace at the right blasts flame from a conical nozzle, and its interior is annotated to distinguish where it is 'all hot' from where it is only 'half hot', charting the distribution of heat within the fire.
Large wheel in a vaulted chamber
A tall segmented wheel is set in an arched, stepped enclosure beside a low walled channel, drawn in perspective as a mill or driven wheel.