โ Scribed by Rowell, Herbert W.
No coin nor oath required. For personal study only.
Paper read before a joint meeting of the Chemical Engineering Group and the Plastics Group on )an. 12, 1934 For niiiny gencr:it.ions piist tlic tcrni '* strength of ~ii:i~eriiils*' ftiis con\qvd to the ~n i i i t l of tllc iiiccliiitiiciil cnginccr no iiiorc tliiin '' strength of iiictiils." 'l'licir tliictility iititl niiilleiiliilit~y i i n t l the fact tlint t.licy riin tic i i i i i t l e Iliiitl i i n t l ciist. i n siniplc nioultls provide conipiiriitivcly easy nictliotls ol' working thciii into the forni rcqnirctl. 'I'hcy h i i w strcng.t,li craft nntl niotor veliicles t,lic Iiisliion in engineering priictice tcrids towiirtl liglitncss of structure iincl $1 Iiigli specific griivity Iicgiiis to lie :I hiintliciip.
JIiiliy o f tlic synt Iietic rcsitioitl niiitcriiils Iiitvc it tensile strength cqiiiil to cast i i l i i i n i i i i i i i i i Iiut itre I i i i l f its liwvy. 'i'licy ciiti I)c f o r t i i d to intriciLtc sIiiip6 i i n d t o t w c t size hy tnriss-Iirotluct ion nicthotls : i d fiisliionctl c:isic:r t,li:iii nict.iils hy ordiniiry engineering tools. dSi~cli iiititcriiil is used citlrcr I~cciinsc of its niccliiiiiiciil strength, sniiilt u-eiglit, or elcct.ric:il iiisiiliit ing propertics or I)cciiiisc it coiiiIJincs id1 tlicsc proprtic.s with ii low price:. So niotor car is const ri1t:tctl to-(lily wit,Iioiit. s(!vcriil 1)icccs of t,liosc iiiiitwiiils r i t d t h y i i w now used iis linislictl coin-Ijonciits or sciiii-iiiiiiiiil'iicturctl i~iittcriiil by iilatiy
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