PROBL. II. The Description of the Gaging-Rod, or Staff.
THe most useful Gaging-Rod is 48 Inches or 50 in length, upon one square there is 2 Lines, a Line of Numbers, and a Line of 48 Inches, every Inch divided into 10 parts for the ready measuring of any Vessels, length, breadth, or depth.
But for the measuring of Great-Vessels, there is two Staffs divided into Inches and 10 parts, made to slide.
On the second side is two Lines, the first to Gage by the Head, and the second by the Bong, which added together multiplyed in the length, will give the Contents; As by Example in the following Problem, and Use of a Table of Wine measure.
And the third square is two Diagonal Lines, for the Gage of Wine the first; and for Ale, the second: which shews the Contents to the 1/10 part of a Gallon according to 282 Cubique-Inches in a Beer or Ale-Gallon, the Use in Probl. 7.
On the fourth side is a Line of Segments, or 63 Gallons divided into 1000 parts, as you may have the Use by the following Table in Probl. 8. The making of this Staff is best known to the Instrument-Maker, by reason it must be exactly done; and you may have them of Mr. Philip Standridge in Bristol, and by Mr. Hays, and John Brown in London, Mathematical Instrument-Makers.