126 RKPORT— 1S39. 



were made at the expense of Mr. William Fairbairn. The following 

 were some of the results : — 



Description of wood. ^^- f ^^P^^'^" ^^^° ^«^^^' Per square inch, 



'■ ments made. which crushed the specimen. 



Yellow Pine 3 5375 ft. 



Cedar 3 5674 



Red Deal 3 5748 



Poplar, not quite dry ... 3 3107 



„ dried two months,! , 



(length 1 inch) ./ ^ ^^^* 



Larch, green 3 3201 



„ dried one month, 

 (length 1 inch) 

 Plum-tree, wet, though felled 1 „ aanA 



two years / "^ "^^^^ 



Plum-tree, dried two months .3 824-1 



Birch, green 3 3297 



„ dried two months, 

 (length 1 inch) 



Sycamore .3 7082 



Ash 3 



„ dried two months, 

 (length 1 inch) 



English oak .3 6484 



„ dried two months, "1 ^ q/^aq 



(length 8 inches) / ^ ^^^^ 



Spanish mahogany .... 3 8198 



Box-tree .."..... 7 9771 



The woods above (except the Poplar, Larch, Plum, Birch, and Oak,) 

 were all moderately dry ; and where it is stated that they had been 

 dried for any particular time, it is to be understood, that specimens 

 prepared, and not used when the first experiments were made, were 

 kept in a warm, dry place, during the time mentioned, and afterwards 

 re-measured and crushed. 



I 1 5568 



^' I 3 6402 



'' j 1 9363 



Experiments upon the effects of Weights acting for an indefinite time 

 upon bars of Iron. By Wm. Fairbairn, Esq. 

 The experiments, of which the present is a notice, were commenced 

 by Mr. Fairbairn in March, 1837, when a number of bars of Coedta- 

 lon iron cast from the same model, 5 feet long and 1 inch square, 

 were placed horizontally on props 4 feet 6 inches asunder, and had 

 diiFerent weights, as 2^, 3, 3|, and 4 cwt., laid upon the middle of each, 

 the last weight being within a few pounds of the breaking weight. 

 The intention was to ascertain what effect would arise from each of 

 these weights lying constantly upon the bars. The results are, 1st. 

 The bars are still bearing the loads, and apparently may do so for 

 many years. 2nd. The deflections, which are frequently measured, 

 the temperature being observed at the time, are constantly increasing, 

 though in a decreasing ratio, — a fact which shows that, though cast 



