Top ViewShowing Construction of MINNEAPOLIS Double Cylinder Engine on Direct Flue Boiler
Sent to us by Larry Creed, R.R. # 13, Box 209, Brazil, Indiana 47834. Taken from advertising material of Minneapolis Threshing Machine Co.
This is the only photograph I have seen of a Minneapolis double cylinder two stack steam engine. The picture was taken by a Mt. Olive, Illinois, photographer. (Mt. Olive is about 40 miles northeast of St. Louis, Mo.) The threshing machine also appears to be a Minneapolis. The flywheel of the steam engine is almost shiny from constant use. The twin stack concept did not function as well as Minneapolis Threshing Machine Co. intended, and the double stack engines were refitted with a single stack. Thanks to Andy Craig of Vandalia, Illinois, for the use of his photograph. I have some factory information on the Minneapolis double stack engines that I think you will find interesting.
The Minneapolis Double Cylinder Engine, mounted on Direct Flue Fire Box Boiler, is built in five sizes, viz., 18, 22, 26, 30 and 35 Horsepower. They are built to burn wood, coal or straw, as desired.
Each cylinder and guides are made in one solid casting, and set parallel to each other. They are attached to a heavy bed plate and heater frame (cast in one piece) which is securely bolted to the top of the boiler.
It is equipped with a very heavy, forged steel crank shaft, carefully turned and nicely fitted in bab bitted boxes. On the right end of this crank shaft is fastened a very heavy flywheel, with our own patent Friction Clutch, one of the most essential features on any traction engine. Those who do not equip their double cylinder engines with a friction clutch should tell why an engine is better without a friction clutch than with one.
On the opposite end of the crank shaft we have the simplest and most positive and only eccentric pump attached to any double cylinder engine built. This eccentric pump is our own device, and is guaranteed to do the work, under all circumstances. It can be regulated to feed the amount of water required, and can be adjusted to pump continuously, thereby feeding the water to the boiler as fast as it is evaporated. This will allow the heaters to heat the water to a high temperature before entering the boiler. The water is fed into the boiler on both sides, by first passing through a separate heater on each side. Every engineer who has examined this device pronounces it without an equal and the best pump ever adopted.
The MINNEAPOLIS is the only double cylinder engine equipped with the famous Woolf Valve Gear: the most efficient movement for controlling the ports and increasing the power of the engine, ever invented.
A Penberthy Injector is attached to all boilers. A Sight Feed Lubricator and ample Hard Oil Cups are placed on all wearing parts. The entire mechanism is so constructed that the engineer can adjust the injector, the pump, the variable exhaust, the damper, the blowers and the screens in the top of the stacks, as well as operating the engine, without leaving his position on the platform.
The MINNEAPOLIS Double Cylinder Engine, on Direct Flue Boiler, is the latest up to date engine of that type on the American market. We invite the closest inspection of mechanical experts. We want them to compare this engine with every other Double Cylinder Engine offered for sale.
Our customers who have been so fortunate as to secure one of them, heartily recommend them to every thresher man who wants a Double Cylinder Engine on a Direct Flue Boiler.
The BoilerThe MINNEAPOLIS Direct Flue Fire Box Boiler is our own design and is built for high pressure, of the best flange steel, with ample openings for cleaning purposes. All horizontal seams are double riveted. The fire box is very large, and made of heavy flange steel, with ample stay bolts and braces to withstand high pressure.
We have designed a special Combustion Chamber in the fire box, made of fire brick. This fire brick arch deflects the heat, thereby insuring complete combustion, and reheating of all the gases to the highest possible temperature, before they pass through the flues.
In this pattern of boiler, we use the best steel drawn, seamless two inch flues, of heavy gauge, thereby insuring a tight and safe boiler.
We build Double Cylinder Engines on Direct Flue Boilers;
Double Cylinder Engines on Return Flue Boilers;
Simple and Compound Engines on Return Flue Boilers.
We build them to burn Wood and Coal. We build them to burn Straw.
42 Different Styles and Sizes
of Minneapolis Traction Engines.
See our full line of'' MINNEAPOLIS ' Engines.- The most up to date, simplest and best engines on the market.
MINNEAPOLIS Double Cylinder Engines are all equipped with two smoke stacks. A mild exhaust is thereby obtained, making it safer on windy days. No other engine built has this important advantage.
Two smoke stacks on an engine will divide and equalize the draught, thereby spreading the heat in the fire box, so that it will pass through all of the flues alike; it being well known to all engineers that a single smoke stack, with the constant exhaust of a double cylinder engine, must necessarily draw the heat to the centre flues, while the outside flues convey little or no heat.
Another important advantage is less back pressure by using two smoke stacks and two variable exhaust nozzles, instead of one; each of our nozzles is as large as the one nozzle used on other makes of double cylinder engines. The variable exhaust nozzle is our own patent and is used exclusively by us. It is adjustable, and so arranged that it opens and closes in a perfect circle, and always throws the exhaust to the centre of the stack. The engineer can operate it standing on the platform.
The wonderful advantage of two smoke stacks on a double cylinder engine will be readily appreciated by anyone when he considers that a single engine, running 250 revolutions per minute, exhausts into the smoke stack 500 times per minute, and a double cylinder engine, running 250 revolutions per minute, with but one smoke stack, will exhaust into the stack 1000 times per minute; producing practically the same effect upon the combustion that is produced when the blower is turned into the smoke stack, viz., it draws nearly all of the heat in the fire box through the centre flues, producing imperfect combustion, and as a matter of fact, consumes more fuel than it would if it were not for this out-of-date method of constructing a double cylinder engine with but one smoke stack. Just multiply the number of strokes per minute of each engine by two and you have the number of exhausts per minute through a single stack.
Further comment on the merits of two smoke stacks instead of one is unnecessary.
All MINNEAPOLIS Boilers are subjected to the severest cold-water and steam-pressure tests prescribed by law, under the direction of the Minnesota State Boiler Inspector.
The boiler and engines are mounted on heavy broad tired steel wheels, of our own make, with very heavy gearing, to insure ample strength for any work the engine has to do.
The whole mechanism is neatly and substantially built, of the best material, thereby insuring the best results obtainable in any double cylinder engine on the American market.