giS the effect of ivfiter on machinery, Oct, 3f^ 



2a?, A second inconvenience would arise from the 

 increased rapidity of the current during land floods, 

 which would, on these occasions, augment its pow- 

 er so much, as to make the wheel go with an incon- 

 venient degree of velocity ; while the wheel would at 

 the same time, by interrupting the currentj raise 

 the water behind it to an inconvenient height. 



The last of these evils would be entirely removed, 

 by lifting the wheel so far up, by the forementioned 

 contrivance, as to allow the water to pafs free below 

 it. By the same means, its power upon the w^hecl 

 could be moderated, by letting only a small part of 

 the float-board dip into the water*. If, however, 

 this contrivance alone Ihould net be found to an- 

 swer the pTirpose altogether, many other contrivan- 

 ces, simple enough, might easily be adopted to mode- 

 rate the rapidity of the current at this place, which 

 it is unnecefsary here to enumerate. 



Were mills on this principle erected on all the 

 streams that easily admit of it in Britain, machinery, 

 turned by water, might be introduced into many- 

 parrs of the coimtry, that have been hitherto deem- 

 ed incapable of any thing of that sort. In rivers that 

 flow through conr. tries which are comparatively flat, 

 this species of mills would answer better than in the 

 rivers that flow through mountainous countries ; 

 because these rivers are not so subject to sudderr 



rfii intelligible to ord'mry reacfe.s, without many figiiies. To these who 

 areacnuain'.cd with njechanics the abcvehinfs will te perfectly ffufficierft. 



• It is scarcely lecf^jry to o'jssive, that this elevatioi could occasion 

 TO < erar.gement to the mach nqry of the mill, proviced an upright spo- 

 ked trundle of sulBc'.e.it lergih, were employed for catchirg the teeth, cf 

 the inner wheel. 



