viii PREFACE. 
and of three other courses of lectures on the same 
subject, delivered at the Royal School of Military 
Engineering at Brompton Barracks, Chatham. 
Many new descriptions are treated of, and a great 
number of experiments on the strength of timber are 
given in detail as well as in the abstract. Further, 
there are some useful notes on seasoning timber for 
use, and the best means to be taken for its preser- 
vation. 
THOMAS LASLETT. 
58, Maryon Roap, CHARLTON, S.E. 
September, 1875. 
