Show I f HOW t TO 10 TEST HOLLOW TILES S j I 1 t 0 WITH HYDRAULIC DEVICE DEVICE- jj In a series of or t testa tests ts made by y the bureau of ot standards In a pound pound hydraulic testing machine am- am chine chine and described In Technological Techno Techno- logical Paper No of that I bureau walls made of ot common 1 fireclay tiles 1 12 Inches long 12 J Inches s wide and either 0 O. O 8 or 12 i Inches thick were tested to the J point of ot failure These tiles i were first tested Individually and their strength was waa found to tobe j be much greater than that of i those usually used In building J construction Their design was WEtS i such that all ull the net area was In J 0 bearing when carefully set on 1 end In the wall Owing to the I i fact tact that the walls were very veay carefully set by in nn experienced I mason they are considered to have been stronger than those I usually used In buildings 1 1 Of Ot the 32 walls waH which were tested about half halt were built with the cells of ot the tile the vertical and 1 the other half with them hori horl- J A few tew walls of or each construction were tested under an nn eccentric load 2 Inches off otTo i center It was found that considerable differences in the strength of the tile did not have an appreciable effect o on ol the strength str ngUl o ot the walls No ore r Vas 9 ou ill I be between w en the ultimate strength and the load at first crack Walls J having the cells of ot the tile vertical ver ver- had on the average more more than twice the strength of ot those o f having the the cells horizontal i Walls lo loaded ded with an aa e eccentricIty eccentric eccentric- Ity of ot 2 Inches had about one one- 1 t halt half the strength of ot similar walls willis t axially loaded Apparently this ratio Is Independent t of t the thickness thick- thick j ness nes of ot tb the wall wall Scientific J American |