78 TRANSACTIONS OF ROVAL SCOTTISH ARBORICULTURAL SOCIETY. 



accessory if the classification is to be carried out in a satisfactory 

 manner. 



One of the best instruments that we know of for classifying 

 timber of fairly large dimensions for the purposes of sale is the 

 Seafield gauge. This instrument has been in use on the Seafield 

 estates for a long period, having been used when Dr James 

 Brown, the author of The Forester, was manager of woods on 

 the estate, and also, it is believed, before his time. The gauge 

 is essentially a set callipers, with the two principal arms 

 (aai,(?d'i), which are about 14 inches in length, placed at a 

 distance of about 13I inches apart, and a number of arms 

 situated at intermediate distances, as shown in the accompany- 

 ing figure (Plate i), reproduced from a photograph of Gauge 

 No. 2. 



The distances between the arms, which it will be noticed 

 decrease in length from e to a, are as follows : — 



The Seafield Gauge. — No. 



The gauge is made of iron or steel, and is attached in the 

 same way as an ordinary garden rake or hoe to a wooden shaft 

 about 6 feet in length. It is applied to the trees at a distance 

 of about 9 feet from the ground, and the trees are marked with 

 white or red paint according to the following scheme : — 



