THE mixers' friend. 191 



immediately hot, hy throwing a little Fire into 7> N 2. and 

 the IVater of which hoyls, and in a very little time it gains 

 more strength than the great Boyler. For the Force of the 

 great Boyler being perpetually spending and going out, and 

 the other winding up, or increaaing, it is not long before the 

 Force in B exceeds that in L ; so that the Water in 7), being 

 Deprest in T) by its own Steam or fapour, must necessarily 

 Rise through the Pipe R, Opening the Clack I, and so go 

 through the Pipe K into Z, Running till the Surface of the 

 Water in B is equal to the bottom of the Pipe H. Then 

 Steam and Water going together, will by a Noise in the 

 Clack /, give sufficient assurance that B has Discharged and 

 Emptied it self into Z, to within eight Inches of the bottom. 

 And inasmuch, as from the top of B to the bottom of its 

 Pipe U, is contained about as much Water as will replenish L 

 one Foot. So you may be certain Z is replenished one foot 

 of course. Then you open the Cock /, and rejil B immedi- 

 ately. So that here is a constant Motion, without fear or 

 danger of Disorder, or Becay : If you would at any time 

 know if the great Boyler Z, be more than half Exhausted^ 

 turn the small Cock N, whose Pipe will deliver Water, if the 

 Water be above the Level of its Bottom, which is half way 

 down the Boyler ; if not it will deliver Steam. So likewise 

 will G shew you if you have more or less than eight Inches 

 of Water in B, by which means nothing but a stupid and 

 wilful Neglect, or mischievous Design, carried on for some 

 hours, can any ways hurt the Engine. And if a Master is 

 suspicious of the Design of a Servant to do Mischief, it is 

 easily discovered by those Gauge Pipes : For if he come when 

 the Engine is at work and find the Surface C of the Water in 

 Z, below the bottom of the Gauge-Pipe N; or the Water in 

 B below the bottom of G, such a Servant deserves Correction, 

 tho' three hours after that, the working on would not 

 Bamage or Exhaust the Boyler s : So that in a word, the 

 Clacks being in all Water-works, always found the better, 

 the longer they are used. And all the Moving parts of our 

 Engine, being of like nature, the Furnace being made of 

 Sturbridge, or Windsor- Brick, or Fire-stone; I do not see it 

 possible for the Engine to Decay in many Years : For the 



