CATALOGUE OF EEMAEKABLE TEEES. 



63 



VI. — First Instalment of a Catalogue of the more Remarkable Trees 

 of Northumberland and Durham. 



Peeliminaey to a Catalogue of the Kemarkable Trees of North- 

 umberland and Durham, perhaps I may be permitted to describe 

 a little instrument for ascertaining their height, contrived by me 

 in 1872 ; which, as it can be obtained of Mr. Winter, of Grey 

 Street, or Mr. Eobson, of Dean Street, opticians, for a few shill- 

 ings, will enable members to supply the girth at five feet from 

 ground, the spread of branches, and the height (which latter 

 has been hitherto rather a difficulty, ) of remarkable trees within 

 their observation. 



The instrument, as at present made, is a right-angled triangle, 

 with two equal sides or edges (three inches each) cut out of brass 

 plate about one-sixteenth of an inch thick ; a pin about half an 

 inch long is fixed through the plate at such a point, that when 

 suspended by it between the finger and thumb, and allowed to 

 swing freely, one of the two equal sides or edges of the plate 

 shall be exactly horizontal ; the other will then be perpendicular ; 

 and the remaining side at an angle of 45° to the horizon. 



The mode of using it is to suspend it as above described ; and 

 choosing a piece of ground on one side of the tree or other object 

 to be measured, to approach or retire from it, looking along the 



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Atkinson's htps< m eter. 



