Thesaurarium mathematicae, or, The treasury of mathematicks containing variety of usefull practices in arithmetick, geometry, trigonometry, astronomy, geography, navigation and surveying ... to which is annexed a table of 10000 logarithms, log-sines, and log-tangents / by John Taylor.

PROP. III. To Measure Tapering Timber, or Stone.

Those Tapering Bodies are either Segments of Cones, or Pyramids: now the way to measure such bodies, is demonstrated in Prop. the 4. and 5. §. 3. Chap. 4: But now to find the Content of these Segments do thus: measure the Solidity of the whole Cone, or Pyramid, and then find the Content of the Top part thereof cut off, (as if it were a Cone, or Pyramid of it self) and the Content thereof, deduct from the Content of the whole Cone, or Pyramid: so shall the re∣mainder be the Content of the Segment requi∣red: which reduced into Feet gives the Solid Content of that Piece of Timber in Feet. Now to find the length of the Top part cut off, from the Cone, or Pyramid, say,

As the Difference of the breadth of the two Ends, To the length between them:

So is the breadth of the greater End, To the whole length of the Cone, or Pyramid.