摘要:

This article describes the use of white, flexible traffic arrows that lie flat on the ground to guide motorists through construction areas. The arrows increase crew safety and the safety of vehicular traffic.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1986.tb01172.x

出版商:Wiley    

年代:1986

数据来源: WILEY

摘要:

Details for constructing a valve lifter designed to aid workers in lifting valves that are being installed, removed, or replaced are provided. No stress is placed on the valve stem because chains act as slings and do all the lifting.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1986.tb01174.x

出版商:Wiley    

年代:1986

数据来源: WILEY

摘要:

When the aging water system in Germantown, Ohio, needed replacement and the topography of the area seemed to dictate two separate storage facilities, the financially pressed city searched for a unique solution. The result was a combination water tower/standpipe that kept the city's capital investment and subsequent maintenance to a minimum. The split‐level tank is an elevated tank with steel supporting walls in place of legs, which serve as the walls of a standpipe located directly beneath the elevated tank. The design provides a standpipe to service the city's low lying areas, as well as an elevated tank to supply water to a subdivision located on a plateau overlooking the city.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1986.tb01175.x

出版商:Wiley    

年代:1986

数据来源: WILEY

摘要:

The results of tests conducted by the Wisconsin State Laboratory of Hygiene to determine the effect of sunlight on coliform bacteria in bottled water samples are described. On a clear, early spring day in Wisconsin, sunlight caused a reduction in coliform bacteria levels after only 30 minutes of exposure. Complete die‐off occurred after approximately 3 hours. Samples placed behind a window, such as in a car or truck or on the windowsill of a laboratory, also exhibited a dramatic decline in coliform levels, especially in late June, when complete die‐off occurred after 1–2 hours of exposure. Additional tests under various sky conditions and during different seasons led to similar results. Although no die‐off occurred on days when there was heavy cloud cover, it did occur on hazy days. To ensure accurate coliform test results, water utility personnel should be careful not to place sample bottles in direct sunlight, such as sunlight entering through laboratory windows or through car windows.

ISSN:0149-8029    

DOI:10.1002/j.1551-8701.1986.tb01176.x

出版商:Wiley    

年代:1986

数据来源: WILEY