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1376 - 1400 of 2123 Items << < 51 52 53 54 55 56 57 58 59 60 > >>
1376 - 1400 of 2123 Items << < 51 52 53 54 55 56 57 58 59 60 > >>
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Passing through Government Town, two trucks linked together handle heavy steel girders from CBI concrete-placing trestle.
1942-03-20
2024-11-23 |
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Car-controlling mechanism (left) for the gearless passenger elevator block 11. A steel tape attached to the car and running over a seave in the housing (at left) drives, by means of a chain and gears, the threaded shaft in the car controller. A...
2024-11-23
2024-11-23 |
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Merchantable timber cut by W.P.A. forces is moved to the water's edge. It will be purchased by the Lincoln Lumber Company and moved by them to their sawmill.
1939-04-14
2024-11-23 |
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One of the three fish traps at Rock Island Dam on the Columbia River near Wenatchee, Washington. The traps were made a part of the fish ladders in existence at the dam.
1939-07-26
2024-11-23 |
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The contractor's railroad crane places a painted or dipped trashrack in storage. The racks will not be moved to the dam until the paint has dried. If the heat of the sun is too severe, the racks are sometimes sprayed with white wash so that the...
1939-09-30
2024-11-23 |
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Automatic timer and locking device for controlling the operations of the mixers. The 4-yard mixers cannot discharge a batch of concrete until they have run the required time (usually 2 minutes) as set on the timer for each mixer. Should the...
1938-12-28
2024-11-23 |
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Open pit mining in progress at the Brett gravel pit. This is the elevation 1650 level which Consolidated Builders mined during 1939, and where they found sufficient aggregate for all concrete production requirements.
1939-02-27
2024-11-23 |
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Filling diversion block 32, looking downstream, December 23, 1937.
1937-12-23
2024-11-23 |
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Repairs to highway bridge pier No. 2. Shows 36-inch I-beam inside steel caisson around pier and cuts in old concrete pier as keyways for additional concrete
1936-04-01
2024-11-23 |
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Here is shown the sharp elbow section which served as a transition between the outlet of the needle valve and the turbine draft tube liner. In the background is the needle valve with its air intake collar attached.
It was the extremely short...
2024-11-23
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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...
2024-11-23
2024-11-23 |
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By the spring of 1943 the floor of the structure had become unsafe for further use, and being no longer necessary for trucking operations, the U.S.B.R. began to dismantle it. During the fall of 1946 the U.S.B.R. removed the center pier, leaving...
2024-11-23
2024-11-23 |
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Ball-type speed governor on 10,000-pound gearless, traction-type elevator, in Block 11. Excessive speed of the car will cause this governor to interrupt the power supply, set the brake on the hoisting machine, and engage the safety jaws on the car...
2024-11-23
2024-11-23 |
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Columbia Basin Project, Irrigation Division, West Canal, Specifications No. 1286--Utah Construction Co. and Winston Bros. Co., Contractor. Looking west into open outlet transition of Dry Coulee Siphon No. 2. The forms are warped from vertical to...
1948-09-28
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Cuts and fills for the new railroad grade between Kettle Falls and Williams on the relocation of the Great Northern Railway.
1940-10-23
2024-11-23 |
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W.P.A. workmen use 90 horsepower tractors to push over small trees of no merchantable value. They are then cut and burned to clear the reservoir area above the dam.
1939-06-27
2024-11-23 |
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Sandblast cleanup of trashracks or grills prior to painting.
1939-09-30
2024-11-23 |
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An aggregate batcher and its automatic cut-off scale for weighing a batch of aggregate. The scale may be set for a number of different weights, any of which may be used at the option of the operator. However, the weight of particular aggregate is...
1938-12-28
2024-11-23 |
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Two conveyors running from screening and washing plant to two sizes of finished gravel piles over 48-inch main conveyor for transportation to mixer stock piles.
2024-11-23
2024-11-23 |
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Keys grooved in old concrete in base of pier No. 2 of highway bridge, prior to adding 8,400 yards as reinforcement.
1936-04-01
2024-11-23 |
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This is one of the 84-inch needle valves temporarily installed in the penstocks of the right powerhouse. In the background to the left can be seen the lower end of the penstock liner, to which it will be connected. As of January 01, 1946 the...
2024-11-23
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Movement of materials to the camp site was commenced in the latter part of October to permit construction of the camp headquarters and make possible the starting of tunnel excavation during the winter months, thus providing storage for the water...
2024-11-23
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