2G1 



On Measuring grouping Timber. 



37 



customafy in different districts ; and, when 1*388 is 

 subdivided into four equal parts, the half and quarter 

 inches are shown. 



The quarter girt scale, without allowance for 

 the bark, requires one foot to be divided in the 

 ratio of 9 '4 2 5 equal parts, each part representative 

 of an inch being 1'273 in. 



The circumference scale requires one foot to be 

 divided in the ratio of 37"698 equal parts, each 

 part representative of one inch, being 0*318 parts 

 of an inch. 



The diameter scale is divided into real inches and 

 parts. 



In making valuations of growing timber, the 

 hedgerows and standard trees are usually all gauged 

 tree by tree ; but in large woodlands they are 

 usually numbered in successive portions, enclosed 

 within a white cord line, and classed under their 

 respective heads, and some average trees then 

 gauged. 



Timber intended to be exposed for sale, when 

 not cut down by the exposer, is usually gauged tree 

 by tree, and a prepared list of the measurement and 

 value put into the auctioneer's hands to assist in 

 guiding him. — London, May 30. 1837. 



Explanation of References in Figs. 37. ajid 38. 



Fig. 37. shows a side view of the gauge. 



a a, Scale arm of box, lance, or any kind of elastic wood, de- 

 fended on the edges with slips of thin brass plate, to make 

 the tangent arm move more easily. 



b, The fixed tangent arm. c, The movable tangent arm. 



d, A sheave over which the cord ^ ^ is drawn, to move the 

 tangent arm (c). There is a double sheave placed on the side 

 of the movable joint f, over which the cord is also drawn. 



e e, Cord for drawing the tangent arm {c) close upon the 

 tree. J", Movable joint. 



g g, Semicircular guide of iron or brass, to fix the scale and 

 tangent arms square, to gauge branch wood. 



