Show lp STIR x 1 1 t ff MIN frach t I 1 weakness of f wood 11 li til ill keln the itie fill art that it Is made tied up lip of a bun bull tile lie of fibers each filter by itself will ad B consider aide able I 1 ae pull but each fiber in the bundle Is t held loosely to it its neighbors on bit all aide bides to make a wood vod that ica IB ibm or of standing strain 1 in all directions it I 1 Is to combine tor eral aaers s cut at various angles ables to the grain D thus 1 Is made plywood sold said to be literally ly stronger t it etian steel it Is IB revolutionizing airplane co construction luction and it nill w enter conspicuously con aliu oust y into postwar post war industry it la is eien possible that s a a wall all cohering ring the thinner th in iss will still compete tc with wallpaper al limper they possess all 11 tic the binary beamy and ad dur dura bollt baliti of hall wood paneling for their that composite out nature p prevents did them fr from warping thin plywood has be been found flood in and ad ity to compete favorably with textile fabrics in 11 tile the manufacture m a allure of ale air pie plane as if anione should no an offhand that weight far or weight eight flood mail was stronger than attal affel ha be would be laughed at hoa however car the he forest dmd products r labora labor tory y of tit the department or rhem which I 1 18 responsible for or our it T a I 1 ede I 1 of pl plywood plod od and the various uses to which tt it ma am he be put he has devised a testing machine which pro proves as this very thing orda on or of acm course th the of tile the wood la is estimated by the pull it will nill stand eland running with and not against the grull grain for ex simple ample a toothpick of plus pine wood ad placed 1 la this machine with it the fit isau of 1 poll ing it apart in the middle will usually stand a pre pressure re of from 75 to pon pounds ids bafo before it ches way As grumt this a 3 9 trill inch length of steel I 1 am wire of if the 1 samp I weight eight AS the tenth pick g generally rally ili gaea way toy when tile the tension reaches about SO 80 pounds pound N S a ehms liadal mith w ith thin machine h hi a shown 1 n that all of the denser loois boffi can an beat steil J by from to lo hat pr pir cent when A he tested across the grain have however er the tot bet of wood all r f re u one fourth to one half of the dr la of rf 1 that why plywood ply od na me itt irtA coital ti the e perri gaudh anad n tile mic manufacture fact of plywood ary ry in ahli ann km s accord ing to tile the article to be made of it in t tue he cone case of nf mate lot for far airplane ems w ins for example elo the are am only 01 inch of thichon gluing giants thin veneer at lot into a rs till thin lazarof ani of TAIM TAI M lot lias be bean A ao ditri ammy difficult matter tor for ill the the ric principal cense of trouble he has been tins hie exe excessive and ad of f the it thin in pue plies due as to their it alon of water uster train from the let glue shirb causes es over morla lapa and ad R amount ot of wrinkling tinkling A a acrond bonne an p of IT trouble mile 1 IB 1 in the belittling of die very it hm matell matr matt rial ll when hen it has haa awn tonica with va it wet at able since it is then very fragile and ad ewalb 01 ruined to 0 en oine me ili ill llie forest products has evaded 11 PT m ahli h coul boullt lt of makilan maelna a shoot of glue br thin lieeie of at aluc it paper iolli glue 11 an ing it I 1 to silly dry tied fluid wing the canted ad fa m per us the glue alme Is iner for it I 1 ibe be come of making the eamil on inn 3 arle c cy cov a ofes aase conod con slits cl no merely c in lading bating am aa many any khoste slims of if thin veneer and timms sheets of this thin glue tissue nf a may be required to build up the panel desired th alicea or are then than pressed in a steam heated the re result rt Is an ill panel 1 in which h ill the e moisture contina has be ben been changed not more calm ihan 1 or 2 per cent she pie method eliminates the denotes tiou oles re suiting bulling froni from the use of if a vet tnt glue and ad makes make the handling of the thin material elect A an easy matter the extremely thin p secured I 1 in this manner and leitell on an airplane ings wit built eap especially emily for far tile the purpose strong it wa Rs found that it ge gae between ff 6 and ad 8 per par real cent added lifting homr over the linen imen ordinarily used need by maan ma an of the fact that the nip ap of if 0 t a c clatl ill 1 Is entirely IN elbit fur fr weight eight its pr jirovec it to be a ap proximately the settle and it 1 Is quite likely that so in the future nil all non min metal mig nanga may b be cohered it with olat ti nia me nh ahen pl plywood achl we ailt thought of in connection with airplanes an ap parent par at lv insurmountable difficulty pre poe dented ut itself A machine that had to be out 1 in all 11 kinds of weather and it spond reach much of its tire time I 1 in a d dense case fog g and in thick clouds it must not be held together nn lere by glue that water would dissolve oll to tomed er this dlf 0 to new glues gless were well evolved by the laboratory experts expert one made from the bl blood d of and ad a oue derl ed fria broto casein obtained from film inick panels a glued erl together go tit with these and metod 1 in boilen boiling la water later for far eight hours hour at the expiration of this time none of the place pieces showed any separation of the piles soaking la in cold water hater for far ten dam istee the snoie same results alte finally filially testa walh till a doering machine width which applied force farm h in buh anh a manner as to DO push a all one a pit train rom another vele made and it was wag demonstrates that a pressure of nf from to hundred and lint to sem seen hun bull dred pounds to the square inch of glue surface waa vas required to separate the lulled lu llev sv so strong were date the new dew glues As a inviter of fact it was ana in moat at 1 eases ae not at the glue but the aid ad liters filers theina themselves aha kimt rare 1 I way say in considering the it of this thin new nev aster proof alue and ad pl plywood old to Ini luMry in A our p period lt it minest eldina that an to en obar arbun t eliely ill y new w fit ald id haa opened for pro breshe manufactured of wood ur ar i who till now it bais put OR on it the s standard door that till not it w tom arp diw wood d it connot w app rp after they are finished for one ply holds hold tin the next hit marm fae 1 l has hal a rt out it 1 table or chair betor with will blued slued I 1 it ed joints that will vill not net get shaky h a ly 1 in dapsi damp irmi funi ture lure made tilt casein glue ill biml hold tog together tile far better 1 1 or or smaller booden articles haibt up tip nood anoil has ritualism immediate application ont not only 1 in replacing solid material but in extending arding the hie of small ims and low to an some som of alie J altmin tah already ot of ut at 1 I lie 1 ie forest pectin la in with iab I 1 elbeat el lent re alt in eer bieri ease case ate aiu tc traus aus secal hiilis habs plow beams sled fled runner gun stock bell base ball bate bata booking pie shoe be let lasts ha block and ad ladder editor rails 11 een c bull built up railroad ral troad ties itea and telephone telephony tele phona are by no beyond bc ond the of pas possibility thinly one cannot fall to be Im impressed b hi the tha of plywood as a a afee be tor lor of not net only would world ff make possible he baving ing of a lore largi fir par percentage comy ot of abat wooda and mill callio land waste lasto but it might arlott mr revolutionize lott ar a orent orant pres milling and grading practices se sa ht and clear material the value of at which Is now lost in um boanes or dis db count counted e it bv bt irig low grade de classification mold could b be untilled util led rod and bied valued an aa kr at now the more valuable hard hardwoods from the standpoint of ealce tb there D re beem to be re no limits to the possible substitution of p plywood I 1 0 o ad tor for most forms forma of solid woo wood 1 I |