STRENGTH OF TIMBER.

Stratford Evening Post, Volume XXXI, Issue 35, 26 September 1911, Page 2

STRENGTH OF TIMBER.

An interesting report has hemi-omule to the Department of Foresty oy ibo lessor Warren 1 , of the University ol Sydney,* OrU the strength, elasticity, wnd other properties of Now South Wales harp-wood timbers. The teds were commenced in 19Lb, and continued up tw the end ol last year, and the’ trees used were selected uy the department's l experts from the aoicJi and South Coasts district*, average specimens pi normal growth being cnoseii. The experiments included : (i.) Tests of cubes in compression, cut from sections in tno tree at various neights fromi the ground m order to determine .any variation in' strength depending on the height above me ground; (2) tests as to the strength .aid elasticity of large and small uuuier beams; (d)' strength and elasicity of long and snort columns of Limoer subjected to compression; (i; tno shearing stiengtli or limber j •») tno tensile strongoii of timber; (u; tne holding power ol nails and spikes; i j) tno compressive strength across You libro; (tty hardness tests; (9) torsion tests; (iU) resistance to wear in noors and street pavements; (it) impact, tests of beams. Among me conclusions reached—■ which are set out in detail-r-is that, having regaid to me ,moisture present in -each caie, tiuiher ’ cut ,fi om tno highest of live sections of NT ‘tree is slightly stronger cnan that dut irom the other sections, out tuoi are so slight chat cue timber may be considered of approximately equal strength througnoiit the length ol tne trunk.