How mechanical bracing 
restores strength to decayed trees 
T HE internal woody tissue of the tree has 
the same function as 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 mechanical 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 example, re¬ 
quired a combination of bolts and lock-nuts, rein¬ 
forcing 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 com¬ 
bination 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, including cross-bolts, criss-cross 
bolts, iron straps, anchors, torsion rods, iron back¬ 
bone 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 allowed no responsi¬ 
bility until he has conclusively demonstrated his 
fitness. And he must have shown himself to be a 
man of conscience, a lover of trees and a worker— 
a man fully conscious of the great responsibility 
that is his, when he is entrusted with the care of 
your priceless trees. 
Davey Tree Surgeons are the only Tree Surgeons 
officially endorsed by the United States Govern¬ 
ment, which engaged them to save the priceless 
trees on the Capitol grounds and elsewhere. 
They are the only Tree Surgeons endorsed by 
thousands of estate owners—prominent men and 
women whose recommendations you can accept 
with complete confidence. 
And they are the only Tree Surgeons who are 
backed by a successful and responsible house, 
amply able to make good in every instance, and 
not needing, for the sake of temporary existence, 
to sacrifice in the slightest degree its high standards. 
Write today for FREE examination of your trees 
-—and booklet, “When Your Trees Need the Tree 
Surgeon.” What is the real condition of your 
trees? Only the experienced Tree Surgeon can 
tell you fully and definitely. Without cost or 
obligation to you, 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. 
509 Elm Street Kent, Ohio 
(Operating the Davey Institute of Tree Surgery) 
Branch Offices, with telephone connection: 225 Fifth 
Ave., New York: 2017 Land Title Bldg., Philadel¬ 
phia: 450 McCormick Bldg., Chicago. 
Permanent representatives located at Boston, Newport, Lenox. Hartford 
Stamford. Albany, Poughkeepsie. White Plains, Jamaica. L. I.; Newark. N.J.: 
Philadelphia, Ha risburg, Baltimore, Washington. Buffalo, Pittsburgh, Cleve¬ 
land, Detroit, Cincinnati. Louisville, Chicago, Milwaukee. Minneapolis, St. 
Louis, Kansas City. Canadian Address: 22 Victoria Square, Montreal. 
DaveyTreeSurgeons 
FOR SAFE TREE SURGERY 
Every real Davey Tree Surgeon is in the employ of the Davey Tree Expert Co., and the public is cautioned against those falsely representing themselves. 
