Many More Buy Them Every Year
The Main Points of Advantage Fully Explained by Illustration
Why An Avery Undermounted Engine Is More Durable
In the construction of Top-mounted Engines the Cylinders,
Gearing, ground wheels and other parts are all bolted to the boiler
by means of brackets. The boiler shell serves as the main frame
work of the engine, and must bear all the severe pulling and
twisting strains of traction work. Ordinary boiler shells arc only
or 5/16 of an inch in thickness and in
exceptional cases inch, and think of ita thin shell like this
having to carry all the weight of the brackets, gearing, cylinders,
etc., and having to stand all the pulling strains.
When you think of this it is easy to see why Top-mounted Engines
are not durable for heavy traction work. Every experienced traction
engine operator who has used a top-mounted engine for any kind of
heavy traction work knows what the results are, for these strains
on the boiler cause ail kinds of trouble in the way of leaky cap
screws, loose brackets, etc., while in some cases the strains are
so great as to even bulge the boiler itself, drawing the gearing
out of line and causing the shafting to bind and spring.
But with an Avery Undermounted Engine you get rid of all
these troubles. It is much more durable because the boiler is
entirely free from all pulling strains. The entire working
partscylinders, gearing, ground wheels, etcare all mounted on an
independent angle steel framework. The cylinders are bolted to the
steel framenot the boiler. The gearing and ground wheels are all
fastened to the steel framenot the boiler. The load is all pulled
by the steel framenot the boiler. There are no pulling strains
whatever on the boilerthe steel frame work takes them all.
In building a Top-mounted Engine, the first thing you do is to
begin boring holes in the boiler to attach the brackets. In an
Avery Under-mounted Engine, you build up the truck all complete,
and then simply set the boiler on and bore enough holes in it to
fasten it on and hold it in position. The boiler carries no weight
and pulls no load.
The line drawings of the Top-mounted Engine and the Avery
Undermounted Engine on this page show clearly why an Avery
Under-mounted Engine is much more durable than the Top-mounted
style. In this Top-mounted Boiler there are 108 boles bored in the
water space for attaching the brackets. In the Avery Undermounted
Engine there are only 18 holes bored in the water space in the open
bottom boilers and 38 in the closed bottom boilers. Only
1/6 as many bolts in the open bottom style
and about 1/3 as many in the water bottom
style, and these bolts in an Undermounted Engine Boiler have
practically no strains to bear, while in a Top-mounted Engine they
have to pull all the load and hold the engine together.
To emphasize stronger what this all means to you when you buy an
Avery Undermounted Engine, we give every purchaser a special
warranty against leaky brackets which is printed right in our order
blank. This warranty reads as follows:
By SPECIAL AVERY WARRANTY AGAINST LEAKY BRACKETS
All Avery Undermounted Engines are warranted for one
year or LONGER against leaky cap acres attaching any brackets to
the boiler, and any defects of such nature will be made good free
Notice that this says one year or longer. There is no time limit
to this warranty, and it covers one of the worst troubles owners
have with Top-mounted Engines. Where can you get any such a
warranty as this on any Top-mounted Engine?
It is surety plain to see from all this that an Avery Double
Under-mounted Engine with its independent boiler has a construction
that will last much longer and stand up in better shape under heavy
palling strains than a Boiler-mounted. Bracket-type Engine. This is
a point that you could consider strongly in buying an engine. The
engine that is cheapest for you to buy, is the one that wilt stand
tip under the work and keep at it day after day and last the
Why An Avery Undermounted Engine Is More Powerful
There are three principal reasons why an Avery Undermounted
Engine is More Powerful on the. draw-bar pull.
The first reason is that with the Avery Undermounted
Engine, the load is distributed better proportionately on the front
and rear wheels and there is no rearing or jumping up of the front
wheels as often happens with Top-mounted Engines when pulling heavy
The second reason is found in the fact that the pull of
the cylinders through the gearing and back to the load is in a
straight line instead of down from the top of the boiler at an
angle as with Top-mounted Engines.
This is clearly shown by the two drawings here and is one of (he
most important reasons why an Avery Undermounted Engine is more
powerful on the draw-bar pull.
The third reason why an Avery Undermounted Engine is
more powerful, is because it has two cylinders, is equipped with
balance valves and has a specially designed curved block valve
gear. With the double cylinders you never have any dead centers,
you can start a load much easier and with less-jerking on the
engine and the load, and get a steadier pull and more power. The
balance valves save steam, relieve the valve gear of much of the
strain required to move the ordinary slide valves, and help to
increase the power of the engine and reduce the amount of the fuel,
water and lubricating oil required. The Avery valve gear gives an
equal lead and cut off at all points with the reverse thrown clear
over or hooked up, and whether the engines are running in one
direction or the other.
When you buy an engine what you want is power. Power for
belt driving and power for pulling. We cannot make this point too
strong about the wonderful power of an Avery Undermounted Engine,
Remember this, that you get more power when you buy an Avery
Undermounted Engine than with any other engine built.
Why An Avery Undermounted Engine is Easier to Handle
The illustrations here show better than words why an Avery
Undermounted Engine is easier to handle.
The two illustrations above show how you have to climb up on top
of the boiler to oil or adjust a Top-mounted Engine, while on an
Avery Undermounted Engine you can reach all the working parts while
standing on the ground.
The illustration here shows three men belting up a Top-mounted
Engine. One man is up on top of the drive wheel and the two men on
the ground are lifting up the belt.
With an Avery Undermounted Engine, one man alone can stand on
the ground and put on the drive belt and do it easier and quicker
than two or three men can put the belt on the fly-wheel of a
These illustrations show you how you fire a Top-mounted Engine
and an Avery Undermounted Engine. In one, the fire door is down
close to the platform, and you have to lean over and bend almost
double to throw in the coal. With the Avery Undermounted Engine you
can stand almost straight up to do the firing.
These illustrations show the style of the ordinary loose chain
guide and the Avery Screw Shaft Steering device. In the chain style
it is necessary for the chains to be loose, and each time you turn
the steering wheel from one way to the other, you have to take up
the slack in the chain. The wheels continually jerk backwards and
forwards and the engineer is kept busy keeping his engine in
In the Avery undermounted Engine, we use a Screw Shaft in place
of chains. There is no slackness at all in the steering device.
When you begin to turn the steering ‘wheel, the front wheels
also begin to turn immediately. There is much less turning of the
steering wheel required. The slackness of the ordinary chain guide
is entirely done away with, steering made much easier and more
positive and the wheels move ahead directly in line where they are
set. The arrangement of the gears is also such that you can turn
the front wheels much more easily than with the chain style. This
is a particularly valuable feature’ for plowing, grading or
The Avery screw shaft guide is the finest tiling in the way of a
guide that was ever put on an engine.
Consider all of these thingsbeing able to get at the working
parts while standing on the ground for oiling and adjusting and not
having to climb around over a hot boiler; the fly-wheel low down so
that one man can belt up the engine and stand on the ground to do
it; the convenient location of the fire door which makes it much
easier to fire; and the positive, easy working, screw shaft,
slackless steering devicewhen you consider all these things, you
will easily understand why an Avery Undermounted Engine is much
Easier to Handle than other engines.
You ought to find out all about the Avery Undermounted Engine.
The Engine that’s built like a railroad locomotive. The Engine
that’s More Durable, More Powerful and Easier to Handle. Write
for free copy of our new 1911 Avery Engine, Separator and Plow
catalog and find out all about it. Address