Document ExaJGGBdvQOoO0M99QQ6qp7aL

Currently Recommended Illumination* Footcandles Currently Recommended Illumination Footcandles STORAGE ROOMS OR WAREHOUSES Inactive Active Rough bulky Medium Fine STRUCTURAL STEEL FABRICATION SUGAR REFINING Grading Color inspection TESTING General Extra fine instruments, scales, etc TEXTILE MILLS (COTTON) Opening, mixing, picking Carding and drawing Slubbing, roving, spinning, and spooling Beaming and slashing on comb Grey goods Denims Inspection Grey goods (hand turning) Denims (rapidly moving) Automatic tying-in Drawing-in by hand Weaving 5 10 20 50 50 50 200 50 200" 30 50 50 50 150 100 500" 150" 200" 100 TEXTILE MILLS (SILK AND SYNTHETICS) Manufacturing Soaking, fugitive tinting, and conditioning or setting of twist Winding, twisting, rewinding, and coning, quill* mg, slashing Light thread Dark thread Warping (silk or cotton system) on creel, on running ends, on reel, on beam, on warp at beaming Drawing-in On heddles On reed Weaving TEXTILE MILLS (WOOLEN AND WORSTED) Opening, blending, picking Grading Carding, combing, recombing, gillmg Orawing (white) Drawing (colored) Spinning (frame) (white) Spinning (frame) (colored) Spinning (mule) (white) Spinning (mule) (colored) Twisting (white) Winding (white) 30 50 200 100 200" 200" 100 30 100" 50 50 100 50 100 50 100 50 30 Minimum on the task at any lime "Obtained with a combination of general lighting plus specialized supplementary lighting Care should be taken to keep within the recommended brightness ratios These seeing tasks generally involve the discnmination of fine detail tor long periods of time and under conditions of poor contrast The design and installation of the combination system must provide not only a sufficient amount of light, but also the proper direction of light, diffusion, and eye protection As far as possible, it should eliminate direct and reflected glare as well as objectionable shadows tThe specular surface of the matenal may necessitate special consideration in selection and placement of lighting equipment, or onentation of the work ft Special lighting such that (a) the luminous area be large enough to cover the surface which is being inspected and (b) the bnghtness be within the limits necessary to obtain comfortable contrast conditions This involves the use of sources of large area and relatively low bnghtness in which the source brightness is the principal factor rather than the footcandles produced at a given point 1591