General Lighting Safety Orders: Issued by the Industrial Accident Commission of the State of California ... Effective December 1, 1919

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California State Printing Office, 1919 - Electric lighting - 63 pages
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Page 22 - ... during those portions of the day when it is available. Three Considerations. Three important considerations of any lighting method are sufficiency, continuity and diffusion, with respect to the daylight illumination of interiors. Sufficiency demands adequate window area; continuity requires (a) large enough window area for use on reasonably dark days, (b) means for reducing the illumination when excessive, due to direct sunshine, and...
Page 23 - ... finish in order that the light which enters the windows or that which is produced by lamps, may not be absorbed and lost on the first object that it strikes, but that it may be returned by reflection and thus be used over and over again. Diffusion also requires that the various sources of light, whether windows, skylights or lamps, be well distributed about the space to be lighted.
Page 57 - Care is urged on the part of those responsible for the health and welfare of employees to see that adequate eye protection is afforded in all operations which are apt to cause injury to eyesight, if such protection is neglected. As typical of such other causes of danger to eyesight, arc welding...
Page 50 - ... use: 1. Utilization efficiency: how much does the reflector contribute to the effective illumination on the work? 2. The effect in reducing glare. 3. Natural deterioration with age through accumulations of dust and dirt. 4. Ease in handling and uniformity of manufacture. 5. Physical strength and the absence of projections which may increase the breakage in case of glass reflectors.
Page 6 - Some Exceptions to the Intensity Rule (a) There are some operations that are performed in comparative darkness, as for example, photographic processes in the dark room. ' (b) There are some operations that are best observed by their own light as in parts of the process of working glass. (c) Some operations are best observed by the "silhouette" method of lighting in which the work is seen against a lighted background in a comparatively dark room as in some processes of working with dark threads and...
Page 23 - The light should be adequate for each employee. 2. The windows should be so spaced and located that daylight conditions are fairly uniform over the working area. 3. The intensities of daylight should be such that artificial light will be required only during those portions of the day when it would naturally be considered necessary. 4. The windows should provide a quality of daylight which will avoid a glare due to the sun's rays and light from the sky shining directly into the eye, or where this...
Page 22 - Lighting for factories, mills and other work places of the State of New Jersey makes excellent recommendations of daylight for the proper lighting of industrial buildings. Adequate daylight facilities through large window areas, together with light, cheerful surroundings, are highly desirable and necessary features in every work place, and they should be supplied through the necessary channels, not only from the humane standpoint, but also from the viewpoint of maximum plant efficiency.
Page 5 - When the natural light is less than twice the minimum permissible intensities of illumination set forth in the following table, artificial light shall be supplied and maintained in accordance with the table. NOTE. — See Appendix for intensities recommended for best working conditions.
Page 3 - Commission to appoint advisors who shall, without compensation, assist the Commission in establishing standards of safety. The Commission may adopt and incorporate in its general orders such safety recommendations as it may receive from such advisors.
Page 5 - Working or traversed spaces in buildings or grounds of places of employment shall be supplied during the time of use, with either natural or artificial light in accordance with the following Orders (1502-1509).

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