950 Method of ascertaining the Value 



books takes one of the arms of the anchor, close to tht 



shank, and holds it firmly, ii are two small lines made fast 



to the hooks, to direct them so as to get proper hold of the 



anchor. 



Reference to the Engraving of Captain H. L. Ball's J/?z- 

 provement in the Formation of Anchors. See Plate X. 

 Figs. 6, 7, and 8. 



This anchor, in external appearance, differs very little 

 from the common anchor ,• the improvement consists in 

 forming and fixing of the shank of the anchor to the stock. 

 The stock a a, figs. 6 and 7, is made of two pieces of oak 

 bolted together, and well secured by hoops. In the common 

 method, in order to prevent the anchor stock from slipping 

 off the shank, a square projection h b, fig. 8, is forged upon 

 the shank ; this is improved by captain Ball, as shown in 

 fig. 6, where this projection dd is extended on each side of 

 the shank, far enough to receive two bolts through each of 

 these extensions, which bolts hold firmly together the two 

 pieces of timber which form the stock, and secure the stock 

 fast to the shank. Two iron hoops, fig. 7, e e, are driven 

 on the stock between the. bolts, and ffff are other hoops, 

 and g ggg are tree-nails to strengthen the whole. 



LXV. Method of ascertaining the Value of Growing Timler 

 Trees, at different and distant Periods of Time. By 

 Mr. Charles Waistell, oj High Holborn. 



[Concluded from p. 332.] 



Observations on Tables I. and II, 



X he preceding tables furnish us with the following useful 

 information, viz. 



1st. That all regular growing trees, measured as above, 

 as often as their age is increased one fourth, contain very 

 nearly double their quantity of timber. 



2d. That when a tree has doubled its age, its contents 

 "will be eight-fold. 



3d. That when a tree has doubled its age, the annual 

 growth will be increased four-fold, 



8 4th, 



