How mcclianical bracing 

 restores strength to decayed trees 



THE internal woody tissue of the tree 

 has the same function a^; the bones in 

 the human body — structural support. 



When this has been destroyed by decay, 

 Nature is helpless to restore it and the 

 tree, if neglected, will soon succumb to the 

 force of the winds. And no treatment can 

 permanently save it unless that treatment 

 supplies scientifically the strength that 

 has been lost. 



Merely to fill the cavity with cement 

 will not answer. The violent swaying of 

 trees by the winds makes correct mechan- 

 ical bracing of decay- weakened cavities 

 absolutely imperative. 



Correct mechanical bracing involves 

 something more than just fixing bars and 

 bolts in the cavity. 



Every tree is different, and therefore the 

 bracing of each tree must differ from the 

 bracing used in all other trees, at least to 

 some extent. 



The tree in photograph No. 1, for ex- 

 ample, required a combination of bolts and 

 lock-nuts, reinforcing rods, and cross-bolts 

 with lock-nuts above the crotch. 



The tree in photograph No. 2 needed a 



backbone and rib arrangement of iron 

 straps, plus torsion rods and anchors. 



The tree in photograph No. 3 required 

 a combination of bolts and criss-cross bolts 

 with lock-nuts, torsion rods and chains. 



The tree in photograph No. 4 was so 

 weak that it required a complicated and 

 complete system of internal bracing, in- 

 cluding cross-bolts, criss-cross bolts, iron 

 straps, anchors, torsion rods, iron backbone 

 and ribs, lock-nuts, bolts above the crotch, 

 plus chains and lag-hooks higher up. 



Davey Tree Surgeons are the only 



men in the world who are really 



trained for this work 



Every Davey Tree Surgeon is trained 

 to the point of finished skill. He is al- 

 lowed no responsibility until he has con- 

 clusively demonstrated his fitness. 



Davey Tree Surgeons are the only Tree 

 Surgeons officially endorsed by the United 

 States Government, which engaged them 

 to save the priceless trees on the Capitol 

 grounds and elsewhere. 



They are the only Tree Surgeons en- 

 dorsed' by thousands of estate owners — 



prominent men and women \\i ose recom- 

 mendations you can accept with complete 

 confidence. 



And they are the only Tree Surgeons 

 who are backed by asuccessfu land respon- 

 sible house, amply able to make good ii 

 every instance, and not needing for the 

 sake of temporary existence, to sacrifice 

 in theslitrhtest degree its high standards. 

 Write today for FREE examination 

 of your trees 



— and booklet, "When Your Trees Need the 

 Tree .*^ursreon." What i.s the re.il condition ol 

 your trees? Only the experienced Tree Surgeon 

 can tell you fully and dclinitely. Without cost 

 or obligration to yoii, a Davey Tree Surgeon will 

 visit your place, and render an honest verdict 

 regarding their condition and needs. Write today. 



The Davey Tree Expert Co., Inc. 

 2109 Elm Street Kent. Ohio 



(Operating the Davey Institute of Tree .Surgery) 

 Branch offices, with telephone coiinoetion: 22.') Fifth Ave., 

 New York: 2017 Lnml Title Huildint.-. rhiludclphia. 

 iW MeCormick Huildint. ChieaKo 

 Permanent rrpreHi-ntiitivi'.! Iiieiit.i.l at l:n^-, 

 Hartforil. Stamf-ini. Albiiny . t'oUKhkoeriSii-.U 

 L, I.; Newark, N..I-; Philiul.-l- 

 phiii, Hnrristiiiri;. M»IIiitiore, 

 WHsiiinKUin. BulTalo. I'itta- 

 baruh, CI*-v,lan.I, Detroit. Cin- 



..cwpnrt, Lonox. 

 < I'lnms, Jamaica, 



;innati, Luuisviflo. ChicnH< 

 Milwnijk(.-t>, MinncnpoliH, St. 

 Louis, KiinsiiH City. 

 Canailian Aildresa: 22VictorIa 

 Square, Montrrul. 



Davey Tree Surgeons 



r V^r\. O/t^J /-* X. Ixllillf OvJrxVjtilx 1 and the public is cautiimed against those /alsely representing themselves 



