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Fifty-Two Years Ago: The high and low concrete placing trestles were under construction in 1935 above the town of Mason City (Coulee Dam) They were used in conjunction with the West Mix plant. Several sections of the 60-inch spoil conveyor can be...
2014-09-15
The gravel processing plant was rebuilt between contracts into the world's largest plant of its kind; twice the size of the one used at Boulder Dam. Its capacity was 20,000 cubic yards of aggregate per day. The four towers on the far side of the...
2014-09-15
Water used in washing the gravel was de-silted in the two large tanks in the foreground, and thus was used over and over again for the preliminary washing of the gravel, saving much pumping from the river. The raw aggregate entered the plant on...
2014-09-15
A dispatcher loaded the various finished aggregates on the main hauling belt as the tripper operator at the mixing plant stockpile directed him by telephone. <br> Such a conveyor system, with a belt 48" wide, 10,000 feet long, and traveling...
2014-09-15
This is a Fuller-Kinyon pump unloading bulk cement directly from the car into the silo. By means of mercoid switches in the bell-shaped "wand" the operator holds in his hand, he is able to control the operation of all five of the motors on the...
2014-09-15
About 48,000 car loads of bulk cement, made from almost 3 million tons of limestone, were stored in these 5,200 barrel silos, and then blended in the two at the right. By noting the deflection of the bottom of these tanks, on a calibrated scale,...
2014-09-15
This is the mixing plant operator's control and indicating board. With these controls he was able to automatically weigh any desired amount of components for the various mixes, and to handle batching, mixing, and dumping operations. The lights...
2014-09-15
2014-09-15
Here is shown a battery of aggregate and cement hoppers on the batching floor of the MWAK mixing plant. Each is connected with an automatic scale which can be set for any desired mix. In the middle are the two cement hoppers, having a screw feed...
2014-09-15
Governor Clarence D. Martin, in a ceremony attended by many state notables and government officials, dumped a bucket of concrete for the first official pour on Dec. 06, 1935. Governor Martin is the man striding along the right side of the pile of...
1935-12-06
2014-09-15
This view is of concrete placement on the west side during the spring of 1936. During the curing period the concrete was covered with moist sand or bathed in a fine mist of water spray.

2014-09-15
After the concrete was dumped from the buckets it was vibrated into a compact mass by means of electrically driven vibrators, which caused the concrete to spread without separation of the components, and eliminated the entrapped air. The...
2014-09-15
Care was taken to avoid "rock pockets" on the sides of the pour by working the large aggregate and voids out of those areas by use of the feet, and also using hand tools. Notice the "whistle punk" or telephone signal man, on the left, who directs...
2014-09-15
The concrete is being placed on the east side in some of the deep crevices in the bedrock Table of Concrete Strengths. 6"x12' test cylinders, 28 day. Low - heat cement - 4,928 cylinders averaged 4,195 lbs. per sq. in. - Modified cement - 5,180...
2014-09-15
Here is a scene which was typical of the whole construction areas; appearing to the uninitiated as a bewildering confusion of materials, men, and machines, while actually the work was progressing in a very systematical and orderly manner, with...
2014-09-15
This is a main line feed of cooling water running from one of the pumping barges, thru a longitudinal inspection gallery in the dam. The hose connections are fastened to headers for the various coils of cooling pipe embedded in the concrete, thru...
2014-09-15
When viewing the conveyor suspension bridge from here at the east anchor, it can be readily seen that this means afforded the simplest solution to the problem of delivering such great quantities of aggregate to the West Mix, and also the bulk...
2014-09-15
In some ways the dismantling of the suspension bridge was a greater problem than its erection. In this scene the upper section of the center tower has just been toppled to the ground for removal. The island of piling cells upon which the center...
2014-09-15
In spite of the enormous amount of tedious and exacting work they performed, as well as the utter dependence of all operations on the lines and elevations established by them, the field engineers and survey parties received relatively little...
2014-09-15
A winter scene from the platform of the CBI trestle, showing the various cranes. On the flat car in the foreground is an outlet tube gate shell. 20 Diesel-electric trains operating on the trestle carried buckets, each containing 4 cubic yards of...
2014-09-15
This is a view looking west across the dam, showing the span of the great cantilever cranes. The last of the CBI cantilever cranes were dismantled on Sept. 12, 1940. Note the transverse beams inside the trestle towers on which monorail cranes...
2014-09-15
This leak in the downstream corner of the east side cofferdam in March, 1937 threatened to flood the east side excavation area. A crisis was reached on March 19, 1937 when a vortex developed on the river side of the downstream cell cluster, and...
1937-04-13
2014-09-15
This is a view of the deepest hole in bedrock on the east side; 120 feet deeper than average bedrock surface, and 175 feet below low water level of the river (935)". These deep fissures in the bedrock were filled with a dense, sticky clay deposit...
2014-09-15
In the background can be seen a concrete and timber bulkhead constructed across the upstream end of an east side crevice to prevent the material in the forebay from sliding into the pit. This device proved to be ineffectual in stopping the great...
2014-09-15
This view of the downstream face of the frozen earth dam shows how it closed the mouth of the deep crevice in the east side bedrock, and blocked further movement of the clay slope which persisted in flowing into the construction area.
2014-09-15
In April of 1938 drilling and blasting of rock on the upper part of the east abutment was started. From these abutment areas workmen drilled, blasted, and barred down thousands of tons of weathered and loose rock. Excavation of the rock for the...
1938-04-01
2014-09-15
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