of Weights and Measures. 24S 



But my object is not to give more than a cm'sory account 

 of a few of the most singular of my inventions and improve- 

 ments ; and therefore I shall only glance at one more new in- 

 vention, which, from its singular utility in carrying into eifect 

 the imperial system, deserves particular notice. It being al- 

 together a novelty, I scarcely know by what name to call it 

 The instrument which ascertains the interior length of a cask, 

 I term aji interiometer^ in contradistinction to an instrument 

 for inching of vessels from mthout, which I term an exterio- 

 meter: but as this is for taking of dimensions generally, I 

 sometimes call it an imperial meter; because it is to ascertain 

 the number oi gallons or bushels imperial, from the mere invo- 

 lution of its dime?isions. I sometimes think it ought to be 

 termed an imperial cubit; but as names are of no nnportance,. 

 I will show the utility. This will be obvious from the nature 

 of a simple question and answer ; thus, 



Qjiere. — 1. A vessel bemg 5-6 meters in length, 4- meters 

 in breadth, and -5 meter in depth, I demand the number of 

 imperial gallons which it would contain ? 



Solution. 5*6 meters, multiplied by 



4 meters. 



22"4 = product of lengtli and breadth. 

 •5 



Gallons contained 1 1-20 = product of length, breadth and 

 depth. 



Quere. — 2. A cylinder being 5'6 meters in dianieter, and 

 4-2 meters in depth, I demand the number of imperial gallons 

 which it would contain ? 



Solution. 5-6 meteis or diameter squared. 



5-Q 



31 -36 = square of diameter. 

 4*2 = meter's depth. 



6272 

 12544 



Gallons contained 131-712 product of depth and squared dia- 

 meter. 



If the question had been bushels, the process would have been 

 just the same ; but a bushel meter is exactly twice the length 



of 



