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4334 EXCHANGE AVE. (VERNONI tOS ANGETES I1 LOGAN 8-2375 partment of Agriculture Bulletin 1500, The Gluing o{ Wood. The other three West Coast hardwood species generally produced joints with higher wood-failure values thaii did California laurel when tested in the block-shear joints. Except with vegetable glue, chinquapin appeared to be thc easiest of the four species to glue.

In describing the gluing characteristics of these four hardwoods, it may be helpful to compare the results with those obtained on other species with the same types of glue. This was done by comparisons lvith data in U' S. Department of Agriculture Bulletin 1500 and in Forest Products Laboratory Report No. 1342, "The Gluing Characteristics of 15 Species of Wood with Cold-setting, IJrea. resin Glues." In table 3, the species of the present study are grouped, Tor each glue, with species shown to have nearest observed wood-failure values in the reports mentioned. No co-mparison could be made for resorcinol-resin glue because this glue has not been investigated extensively for gluing a large number of species. These comparisons indicate that when reasonable care is used in selection of gluing conditions a species might be expected to produce joints of about the same quality as the species groupecl with it for a particular kind of glue. For example, tanoak may be glued with vegetable (starch) glue under normal or average conditions to produce joints of about the samc quality that would be produced by this glue in sycamore, black tupelo, or water tupelo. The hardwood species used for comparison in table 3 are not native to the West Coast. To afford a comparison with one of the more commonly used western hardrvoods-red alder-it can be said that (of the four species studied) the gluability of chinquapin compares closely with red alder when animal or casein glue is used. When vegetable glue is used, madrone compared more closely with red alder in gluability. These comparisons are not, holever, so close as those given in table 3.

In table 4 another means of comparing the gluability oi the four western hardwoods is presented. In this table the species are described as easy, moderately easy, or difficult to glue with the several glues, depending upon the amount of wood failure developed in the joint in the block-shear tests (table 2). In table 4 a species is classified as easy to glue if the wood-failure values were between 90 and 100 per cent, moderately easy to glue if between 50 and 90 per cent, and difficult to glue if between 0 and 50 per cent.

Considering all the glues used, chinquapin could be glued most easily, followed by madrone, tanoak, and Cali: fornia laurel, in that order. fn summary, the four species do not appear to present unusual gluing problems, although good joints cannot be expected without moderate control of gluing conditions'

Prrts bY welght

Reeorcinol-resin

FPL 48 formula rOb oarts storch, 225 psrte water' 3 parts NaOI{ 10O'psrtB glue, 225 Parts weter 100 parts glue, 3Oo-psrts wate.r 10O barts iesin,r 10 parte walnut-shell flou, -60 -parts watei, l.O part amonium chloride, 1.2 parts tri-calcrum phosphate ' 1. coimmerciat glue mixed according to the manufacturer's directiom r The formula and gluing conditions ued favored the forination of etarved joiute. " frr*-io.--*fa"Uydi: resin receired trom manufacturer without frIler or cat&lyetE incorporat€d ' Table 2.-AveraEe thear-test results of Elued iolnt8 In four West Coast hardwoods' Avemge sh€r-t6t reaults2 r Bred on oven-dry weight and volume at I2-per-c-ent f,.].ly: content. These determinations were made.on.epecimens from the eame lot used in the gluinc exoerimente' 2ThAvo|llahpforethedsnra[ne&ver&ge8hearEtIength.rnp''"ii".i!I..iq'i.;i.f;"f&;d;iii.ii-tr.didlii '"li"tli'iB ii"i"ioiitt*G"tet and 2o tlete for each of the.other epectes' r Conditions u.ed rn makrng t"JG"[ip-""i-i"t *iin ihis glue favoied the formstion of starved jointe'

Table 3.-Spect6 wlth whlch Caltfornla laurel, chlnquapln, tanoak, and madrone compred most cloEely when Elued wlth severel g'lues'r Callfornla laurel ChtnquaPln Madrone

Vegetable (starch).

Animal.

Animal, Urea-reein iF^-Co-o*i"oo" n.e bamd- on-w.ood-failue.value m given in U'S'D'A' Bulletin .mit€ed becauee of lack of d&ta on varrous Bpecre6' t ig'ililiLili""o"i con!itious evoring.atarv-ed joints' i Siliil"i-" Wi"t"tn velloy pine in Bulletin 1500' 5i;;;; ;; black guir in A'lletin lsoo' " Sil;wi; tupelolgum in Bu\etin 150o.

Eil;;; iuf, eum l" Bulletih lsoo'

Sugar maple Magnolia (eP.)

Peisimmon American elm

Ponderoaa Pine3

Yellow birch Black cherrY

Osage-orenge Soft maPle

Ited oaK

Pereimmon Sycamore

Hickorv Rock elm - Mabogany

Oeme-orange llickorY

Sugar maple &ga OqF Magnolie (eP.)

Pecan Black walnut

Susar maole Noble 6r - Mehocsny

Beech White osk

Black walnut

Svcamore Biack tupeloa

Water tupelos

Beech 'W&ter tupelor

Red Oak

Maple

Swe-etgum 6

Sweetgun6

Sitka spruce

White oak

Rock elm

Butternut BIack tupelo.

Southern yellow Pine

Pecan

Sweetgum6

Soft maple

Ponderosa pine3

Sassafras

Osage-orange

Yellow birch

White ash

1500' ForeBt Producte Laboratory Report 1342, and in table 2 of this report. Resorcinol.resin glue wa s

(Continued, on Page 52)

(Conttnued. lrom Page 50)

I B&Bed entirely on percentage of wood failure developed in the block-shear test (table 2). z When ueed under conditions favoring stawed joiuts.

The Weyerhaeuser Timber Company has started construction on a thirty-foot two-lane truck logging road thirteen miles in length that will open a new tract of timber of great size. Here they will log for all time to come, according to their plans. There is a great forest of virgn timber to be cut, and likewise several thousand acres of forty-year-old second growth trees that will be ready for cutting by the time the virgin trees are gone. Logging will be done on a sustained yield basis, so that the tract should be logged for all time to come.

Western Pine Supply Co., San Francisco, has re.,cently distributed its catalogue of Pinecrest Ponderosa pine doors. The line includes a variety of interior, exterior, and screen doors, available from stock to Northern California lumber dealers.

Announcement is made by The California Door Co., I-os Angeles, that they will close from July I to 10, inclusive for the employees' annual vacation. They feel that this will cause their customers less inconvenience than the former system of spreading the vacation period over several months.

The Insulating Siding Association, 530 Echo Lane, Glenview, Illinois, has just published for distribution an attractive 16-page booklet in colors entitled "Insulating Siding for Your Farm," which may be had free from the association at the above address.

Three sawmills have shut down in the Gray's Harbor region of Washington because of slow market conditions. They are the Wagar Lumber Company, at Junction City; the Bay City Lumber Company, at Aberdeen, and the Blagen Mills at Hoquiam.