10 



A new Dendrometer. 



of mahogany or other hard wood. The table is three and a 

 half feet long, by four inches wide. On the off side (e e), is 

 an index marked in inches and eighths of an inch. Along the 

 centre runs a dove-tailed groove (a a), inch and quarter wide, 

 and quarter inch deep : this groove is fitted to hold the slide 

 (6), in the centre of which, and at right angles across the 

 table, is mortised the support (Jig. 4. c), on 

 which the quadrant (d) is fixed with a thumb- 

 screw. The near side of the table (Jig. S.fg) 

 has the marks opposite the inches drawn across ; 

 on this space may be figured the amount of cir- 

 cumference opposite to each inch of diameter, 

 and also the side of the square of the tree mea- 

 sured, making the ordinary allowance for bark. 

 The following sketch (Jig. 5.), representing three inches in 



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