From William Thornton?: Description and Drawing of Benjamin Franklin’s Bath (unpublished)
Decr: 1787.

Description of the tepid Bath made use of by his Excellency Benjamin Franklin, Governor of Pensylvania, L L D. F R S. &c.

Fig: 1.—A represents the Bath, which is made of white Cedar abt. 1½ Inch thick: It is bound with Iron Hoops; is 5 F.: 15 In:: long, 2 F.: 5 In:: wide, and 2 F: deep.

B. is a large Sponge, suspended over the Edge in a Towel to rest the Head on. C, is a Cock for hot Water, D for cold Water. E a Bell F a Slider, through which the Servants on the outside receive their orders. G a Board crossing the Bath to rest the Feet against. The Water is drawn off by a Syphon.

Fig: 2 represents the ground Plan of the Bath-Room, which is kept uniformly warm in the Chinese manner. The Floor is laid with Flags, or broad flat Stones. Fire is made at A, and the Smoke and rarified Air pass in the angular Channel finding Vent at B.

Fig: 3. An Elevation of the Fire Place and Chimney. To heat the Room a Fire is made at A, but the Smoke does not pass into the proper Duct, till a small Fire be made on the Grate at B, which, when the Door at B is shut, rarifies the Air above, and must be succeeded by a Current rushing from the passage, in the Direction explained in Fig. 2., through the Grate at B. The First at B is then taken out, and the Fire at A continues to burn.

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