| Show age add adds to timber strength String th tetta made by C P buchanan and reported by him la in engineering new news show that sound timber a quarter of a century old Is materially stronger thau than new stock this apples applies only to white pine since that was the wood on which mr made hta his ex at perl pert menta ments but the editor of 0 the capri juit just named in commenting on tha th re alte suits says ay that there Is DO no reason to suppose that oak bard hard pine or any other wood commonly used in building would behave differently it la Is fair lo 10 conclude he believes that all wood maintains ui its bt except ai as decay weaken it or fire are and mechanical abrasion destroys it it he its ay says it 11 may be eald said that thal engineers enil neer aro are al ready using wood for permanent sery ice where it it Is kept under rater rater it its permanent reliability under u a wh lich con dugoni literally a foundation fact last ID in for ue use in supers truo turee tures however engineers are prone to look upon wood as A perishable and temporary mater material tal |
