Davey Tree Surgery is mechanically 
perfect and scientifically accurate 
Unless Tree Surgery is mechanically per- 
Fed it fails. It must of course be scien- 
tifically accurate, but the one great 
requisite of success is mechanical brac- 
ing. The bending and twisting of the 
trees in the terrific winds make the me- 
chanical side of Tree Surgery supremely 
important. There is no "half good" in 
Tree Surgery. It is either mechanically 
perfect and scientifically accurate — or it 
is worthless. 
As examples of some of the problems in- 
volved, note the four photographs repro- 
duced on this page. Here are four trees, 
each of which the Davey experts found 
required a different form of mechanical 
bracing. In tree No. 1. the combination 
of bolts and lock-nuts, reinforced rods 
and cross-bolts with lock-nuts above the 
crotch, was necessary. Tree No. 3 re- 
quired the combination of bolts, criss- 
cross-bolts with lock-nuts, tortion rods 
and chains. In tree No. 5, the tree had 
lo be braced with backbone and rib ar- 
rangement of iron straps, plus tortion 
rods and anchors. Tree No. 7 demanded 
a complicated and complete system of 
internal bracing, including cross-bolts, 
criss-cross-bolts, iron straps, anchors, 
tortion rods, iron backbone and ribs, 
lock-nuts, iron straps, anchors, tortion 
rods, iron backbone and ribs, lock-nuts, 
bolts above the crotch, plus chain and 
lag hooks higher up. Such work as this 
requires the utmost skill and knowledge, 
which can be acquired only through long 
experience and scientific training under 
masters of the art. 
Davey Tree Surgery is the only safe tree 
surgery. It is based on the life expe- 
rience of John Davey. augmented and re- 
fined by the massed experience of the 
greatest body of expert' tree men that 
the world has ever known. We should 
like to have the opportunity of proving 
this to you. 
" When Your Trees Need the Tree 
Surgeon " — write for this book 
— just off tlif press, in which has been compiled a mass of extremely valuable in- 
formation about trees and their needs. Profusely illustrated with a very fine seru>. 
of photographs, it takes up the major troubles of trees and explains them clearly 
and explicitly. Free upon request. Write for your copy today. 
The Davey Tree Expert Company, 280 Elm St., Kent, Ohio 
(Operating the DAVEY INSTITUTE OF TREE SURGERY) 
Accredited representatives available between Kansas City and Boston. 
Davey Tree Surgeons 
Permanent representatives located at Boston. Albany. White Plains, N. V.. Stamford. Conn., Jamaica, 
L. I., Newark, N. J., Philadelphia, Washington, Buffalo, Pittsburgh, Cleveland, Detroit, Cincinnati, Chicago, 
Milwaukee, Minneapolis, St. Louis, Kansas City. Canadian Office, 81 St. Peter Street, Quebec. 
