SOME OF THE CONSTRUCTIONAL WOODS 

 OF BRITISH GUIANA. 



Descriptions by L. S. Hoheukerk of the Department of Lands and Mines. 



Weights per cubic foot, Moduli of Rupture and Elasticity and Break- 

 ing Weights of test bars, calculated and determined from actual 

 experiment by L. P. Hodge, Assoc. M. Inst. G. E. of the 

 Department of Public Works. 



Phtes showing the test bars after fracture from Photographs by the late 

 J. Williams, F. C. S., of the Department of Science and Agriculture. 



Introduction. 



According, to a List recently compiled by Mr. L. S. Hoheukerk 

 ('' Timehri'* Vol. IV, 1917) the known timbers of British Guiana comprise 

 some 250 distinct woods. Of these 17 of the best known or most repre- 

 sentative varieties were selected for experiment by the Public Works 

 Department in 1011 with the results tabulated in the following pages. 



From the scale diagram of relative transverse strength it will be Been 

 that 13 out of the 17 specimens were better able to resist transverse stress 

 than oak, pitch pine, teak or mahogany. 



Fourteen of them were stronger than .larrali, Northern Pine (Pinus 

 Silvestris) or White Pine (Pimus Strobus) and 15 were stronger than white 

 fir or spruce (Abies Excelsa). 



It will therefore be obvious to the users of other timbers that the 

 employment of most of the Colony woods will effect considerable economy 

 in the quantity required for strength, which should be borne in mind 

 when considering the question of cost. 



Plate 1. 



Kdkatara bally. 



Upper 

 Specimen — Weight per cub ft. 45'4o lbs. lb?, per Bq. inch 



Modulus of rupture 12,521. 



Do. of elasticity 1,581,304 



Breaking weight 6*21 cwt. 



'/Uiun. 

 Soft, light, coarse grain, light colour, suitable or drawer! 

 ami interna] fittings. 

 Price per I. nun t,, i B.M. E.o.b. Georgetown, — 



