[ 314 ]' 
ther, when in the ftill. This box muft be of cop- 
per for diftilling fea- water ; mine was made of tin; 
for other liquors alfo. The air- pipe, which paffes 
through the head of the dill, will help to keep the 
air- box from moving to and fro by the motion of the 
Ihip j or, if that fhould not be found fufficient, three 
or four fmall ftruts may be fixed to the fides of the 
air-box. They mud reach to the fides of the dill. 
The cover and ddes of the air-box were punched full 
of very fmall holes, one-fourth inch didant from 
tfach other, and about the twentieth part of an inch 
in diameter. On the middle of the cover or lid of 
this air- box, was fixed a nofil more than half inch 
wide, which was fitted to receive, tb put on, and 
take off the lower end of a tin pipe, which was 
twenty inches long, and paffed through a hole in 
the head of the dill : four inches oTthe upper end 
of this pipe were bent to a crook, almod at a right 
angle to the upright dem, in order thereby to unite . 
the crook to the widened nofe of 'a pair of kitchen i 
double bellows, by means of a-fliort leathern pipe 
of calves-fkin. See Plate X. Fig. i. This tin air- 
box, and many more of them for other perfons, were 
made by Mr. Tedway, tinman, over-againd the 
Meufe-gate, Charing-crofs. 
3. The double bellows were bound fad to aTrame,., 
at the upper part of the iron nofe, and at- the lower 
Ifandle, in order the more commodiouflv to work 
them. And that the upper half of the double 
bellows may duly rife and fall, in order to caufe a 
condant dream of air (befides the ufual contrad- 
ing fpiral fprings withinfide), feveral flat weights of 
lead mud be laid on the upper part of the bellows, 
near 
