358 Astronomical and Nautical Collections. 



., Content Sliding 



No.. Bang Head Lenglh (Wake) by weight Rule 



It appears from this table that the error of the sliding rule is less 

 than a gallon in twelve out of the twenty-one pipes, and that it 

 never amounts to three gallons, including the effect of whatever 

 accidental irregularities there may have been in the form of the 

 staves. The whole sum of the errors, for the twenty-one pipes, 

 amounts to twenty-two gallons : the errors of the common mode of 

 computing amount to twenty-six, with all the allowances made 

 by the most experienced gaugers : so that by one simple operation, 

 the new sliding rule gives at once a result at least as correct, as the 

 best methods now in use by two or three ; and this result remains 

 susceptible of correction, by any further computations that may be 

 thought necessary. 



It may be proper, if great accuracy in the result be required, 

 and be thought attainable, that a table of corrections should here- 

 after be computed which would be entered with the difference of 

 the bung and head diameters, and also with the " wake," that is, 

 as I have already applied the term in a former communication, the 



