copied from Stansfield, Dorothy A., Stansfield, Ronald G. (1986). "Dr. Thomas Beddoes and James Watt: Preparatory Work 1794-96 for the Bristol Pneumatic Institute". Medical History (30): 276-302. [1]

The legend provided is as follows: "Plate 3 The revised apparatus (to scale) (Fig. 1– side elevation. Fig. 2– view from above. Fig. 3– fired tube alternative to alembic. Fig. 4- retort alternative to alembic. Fig. 5- suction tube from brazier alternative.) From Considerations on the medicinal use, and on the production of factitious airs, part II by James Watt, 1975, plate 3; by permission of the Syndics of Cambridge University Library."

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