AMERICAN HOMES AND GARDENS 
SHRP STAMATUAETNERR SSNS 
HAA 
A lock is as strong as its bolt—but its security is entirely de- 
pendent upon how well its mechanism is protected against attack 
through the keyhole. 
If any one of a dozen keys will open your lock, of what use 
is its strong bolt? 
If the merest tyro and sneak thief can pick your lock in two 
minutes, of what use is your lock? 
These are the reasons 
why all the ingenuity of 
lockmaking has led, not in 
the direction of stronger 
locks, but in the search for 
a mechanism which would 
absolutely prevent the lock 
from being opened by any 
means save its own key. 
Warded Locks 
The simplest form of 
protecting the lock mechan- 
ism is found in the warded 
lock. Projections in the key- 
hole prevent the entrance of 
any key not having corres- 
grooves in the key. 
Keyways of Warded Locks 
Further projections inside 
the lock prevent the key 
from turning, unless it fits 
exactly, but the number of 
variations practical in the 
shape of the key is so small 
that generally one out of 
every four is a duplicate. 
The warded lock key of 
your next door neighbor is 
quite likely to fit one of 
your locks. 
Lever Tumbler Locks 
Then comes the lever- 
tumbler lock in which a 
greater number of _ key 
made. 
l 
if 
Interior of a Lever Tumbler Lock 
changes and much greater ll 
security is obtained by using 
a number of flat tumblers. This type of lock is largely used for 
inside doors in residences, for which purpose it is well adapted. It 
offers satisfactory security against picking or accidental inter- 
change of keys. 
Cylinder Locks 
The first lock to offer an ab- 
solute key control and a perfectly 
protected mechanism was the 
Yale Cylinder Lock, now known 
as the symbol of lock security 
throughout the civilized world. 
Each Yale Cylinder Lock re- 
quires a different key. No other 
can possibly open it, and no record exists where a sneak thief has 
succeeded in picking a Yale Cylinder Lock. 
For the interior of your house, it does not matter much 
whether the key to the dining room will also unlock the nursery 
door. For that reason interior doors in most houses are fitted 
with a good grade of lever-tumbler lock. Care should be exer- 
cised, however, not to choose too cheap a lock, as it will quickly 
become useless and have to be replaced. 
In case it is desired to have additional security, it is always 
very easy to add a Yale Cylinder Night Latch to a door. This 
ACA 
A Yale Cylinder cut open to show how the 
key when inserted sets the pins so the bolt 
may be thrown 
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Locks and 
Hardware are 
so well known 
because they 
are so well 
Yale & Towne Mfg. Co. 
9 Murray St., 
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is a form of Yale Cylinder Lock in which 
the bolt is autcmatically shot, thus pos- 
sessing the advantage of not requiring the 
insertion of the key in order to lock it. 
The Yale Cylinder Night Latch, in ~ 
a wide variety of forms, is also frequent- 
ly added. to outside doors, kitchen doors, cellar doors or any door 
where access to the house 
c might be made. The Yale 
Cylinder is also incorporated 
into even the most elabor- 
ate designs for door sets, 
such as are used on outside 
entrance doors.: 
There are Yale Cylinder 
Locks for sideboard drawers 
and cupboards,  pantries, 
closets, bureaus and desks, 
for trunks and boxes. You 
will always find a Yale Cyl- 
inder Lock for your pur- 
pose. 
A Yale Cylinder Night Latch 
Padlocks 
The mechanism of the 
Yale Cylinder Lock is also 
found in padlock form, and 
many of the best automobiles 
are today completely equip- 
ped with Yale Cylinder Locks 
before they leave the works. 
Another great advantage 
offered by the Yale Cylin- 
der Lock is found in the 
master key. You may have 
any number of Yale Cylin- 
der Locks, for each of which 
a different key is required by 
your servants, or employees, 
and yet you may carry one key 
which will open every lock. 
The highest type of lock 
security is found in the Yale 
Bicentric Lock. It contains 
two separate  pin-tumbler 
mechanisms—one for the 
individual key and one for 
the master key. 
This is perhaps the most 
wonderful of all the forms of 
the Yale Cylinder Lock, as it 
not only offers perfect se- 
curity, but it also fixes the 
responsibility. for the con- . 
tents of any room or build- 
ing or box upon the man 
who carries the key. 
No other key will open that particular lock, and yet the 
owner of the master key may make an inspection at any moment 
without any warning. 
This also does away with the necessity for carrying a huge 
bunch of keys, a service which is greatly appreciated by every man. 
It must be remembered that lock security is exactly what the 
words indicate. “The ordinary door may be battered in or broken 
from its hinges, but this is not the method pursued by sneak 
thieves and burglars. ‘The success-of their operation depends 
entirely upon stealth and the absence of noise, which is sure to 
lead to their discovery. 
This is all the more reason why it is ‘essential to vise your 
outer doors protected by Yale Cylinder Locks. ‘They cannot 
possibly be picked or false-keyed by a sneak thief. He is apt to 
give up the job in disgust the moment he sees the name 
“Yale” on the key plate of your door. That little word is in 
itself almost an insurance against theft. The thief knows only 
too well that the one way to get by a Yale Cylinder Lock is to 
break down the door, and to this he never resorts. 
Most helpful in the selection of locks and hardware of all 
kinds will be our little book entitled ““Yale Hardware for Your 
Home.” We shall be glad to send you a copy free if you will , 
send us your name. 
New York 
LMM 
April, 1912 
