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The largest order ever placed for steel towers has just been executed by the Aermotor Company, Chicago. The order was for 1200 steel towers to support large electric cables. These towers are to be erected in the interior of Mexico, to carry electricity from an immense water power plant up to the mines, over 100 miles distant. The order for these towers came to the Aermotor Company unsolicited. The reputation of the Aermotor Company for building the best steel towers, for windmill and other purposes, brought them this unusual order. When the engineering and mining experts, who were placing the contract, were making up their specifications for these towers, they found no place in the construction of the Aermotor tower where they could suggest improvement. The sizes of some of the parts were changed to meet their particular needs, but the design of the towers remained precisely the same as the Aermotor Company perfected it years ago.
It was of very great importance to the company buying these towers to secure the greatest possible strength with the least material. These towers were to be placed about 500 feet apart. The weight of the long span of cables would be a very heavy load, to say nothing of the enormous side strain which might come upon the towers. Then, too, the contingency of one or more of the cables breaking, and throwing unequal strain upon different parts of the towers, had to be considered. The Aermotor Company guaranteed these towers to stand until the 3-inch, extra strong wrought iron pipe in the top should bend over. They stood this very severe test without the least indication of buckling in any part of the tower.
The item of freight was another important consideration. These towers, as built by the Aermotor Company, made over 75 carloads. No other concern could have furnished towers of anything like the same strength with less than 100 cars of material.
The Aermotor Company has a very great advantage over all others in the manufacture of steel towers. It was the first in the field, and had all the most vital features fully covered by patents before competitors were through laughing at the idea of a steel tower. The Aermotor tower was designed by mechanical experts who knew what points were essential to secure the greatest strength with the least material.
Testing the Towers.
The tops of the corner posts of the Aermotor towers are dovetailed into each other and securely clamped together. This makes them as solid as though they were welded into a single piece. This patented device in the Aermotor tower brings all of the strain directly upon the corner posts where it belongs. The braces and girts have nothing to do but hold the corners in line. Because other makers are not able to adopt this feature, they are compelled to use a large amount of extra material in their towers, and even then their towers are not so strong. Weight often indicates weakness rather than strength. All the weight not needed serves only to bring additional strain upon the parts which must bear it. The best steel tower, like the best bicycle, is the one which secures the greatest strength with the least possible material. The Aermotor tower is strong, safe and durable. Every pound of steel which is put into it is used to the best advantage. A tower twice as heavy, but poorly constructed, would be weaker.
The tower is a very important consideration in buying a windmill outfit. If the tower goes down, the best windmill will be worthless.
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AERMOTOR CO., 1306 TWELFTH ST., CHICAGO