Annual Report

Capa
1911
 

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Página 30 - ... here and abroad which have passed all standard physical tests in which these limits have been exceeded in one or more particulars, and it is equally true that a sound and satisfactory cement does not necessarily result from the above composition. It is probable that further investigation will give a clearer understanding of the constitution of Portland cement, but at present chemical analysis furnishes but little indication of the quality of the material.
Página 40 - As the face of the canyon opposite the lower power line [the aqueduct line between Powerhouse No. 1 and Powerhouse No. 2] is exceedingly rough, and the dip and strike of the slate such as to threaten slips, in case side-hill excavation were made, this portion of the line was also placed well back under the mountain and will be constructed from adits [tunnels] run in from canyons.
Página 36 - When this tunnel-work was started, it was estimated that a reasonable progress for each end would be 8 ft. per day with three 8-hr, shifts, and a bonus-schedule was adopted by the Board of Public Works, which provided that each man working in the tunnel, up to a shift of limited size, would receive a bonus of 40 cents for each foot that this schedule was exceeded, the progress to be measured at the end of each 10-day period. This bonus was paid in addition to the regular wages for tunnelwork in this...
Página 1 - His primary concern, like that of his clients, was with the proposed diversions •Sixth Annual Report of the Bureau of the Los Angeles Aqueduct to the Board of Public Works, Los Angeles, 1911. from Sespe Creek. At worst, St. Francis Dam was regarded as a possible opening wedge for future encroachments upon the waters of the Santa Clara and not as a serious threat in itself.10 Mr. Grunsky was sure that Los Angeles had no intention of storing the natural runoff waters of...
Página 48 - The water is well adapted for irrigation and is suitable for a municipal supply, the chief hardness being of the temporary type. Small amounts of soda ash should be added before using this water in steam boilers.
Página 44 - ... the appointment was authorized of two inspectors of coal and other mines in the District of Alaska, pursuant to the act for the protection of the lives of miners in the territories (Act of March 3, 1891 : 26 Stat L., 1104), and the supervision of the inspection of structural materials was transferred to the Bureau of Standards of the Department of Commerce and Labor. In 1911 provision was made (Act of March 4, 1911; 36 Stat. L., 1363, 1419) for tests or investigations, other than those performed...
Página 39 - ... delays on account of shaft and cave-ins, the average progress was 11 ft. per day. The average progress for the two headings for the 1,215 days' work was 22.1 ft., or a little better than 11 ft. per day for each end. The connection of the two headings was made on Feb. 28, 1911, after the expiration of 40 months of work. (The time which the Board of Engineers estimated as necessary to complete this work was 5 years.) The center-line of the tunnel met within 1J in.
Página 33 - ... desert yield materials suitable for the manufacture of cement. The Colorado River drainage in California is small and unimportant and a general investigation of its waters was not attempted. Some analyses of the waters of Salton Sea are given on page 125. SIERRA SUBDRAINAGE. OWENS RIVER. DESCRIPTION. Owens River rises in the eastern slopes of the Sierra Nevada near San Joaquin Pass, at an elevation of over 10,000 feet above sea level, and about 90 miles from its source discharges into Owens Lake....
Página 34 - ... analyses of the water of Owens River at Round Valley is incomplete, and it is therefore impossible to form a conception of seasonal variations as exact as might be desired. The water is alkaline carbonated in type, being unusual among California surface waters in this respect. The analyses show that the amount of dissolved mineral matter varies greatly during the year, falling below 100 parts per million when the snows are melting and increasing to more than 275 parts per million during the dry...
Página 18 - It is 12 feet wide on the bottom, with side slopes of 1 to 1, a berni of 3 feet, and embankments 6 feet wide on top.

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