Boots – shoes – and leggings
Patent
1990-05-17
1991-06-25
Shaw, Dale M.
Boots, shoes, and leggings
235 61R, 434 72, G06F 300, G09B 2500
Patent
active
050273078
ABSTRACT:
An apparatus for selecting optimum lighting fixtures for a given application first determines a room cavity ratio from entered values of the dimensions of the room. The room cavity ratio is used to select from tabulated values a coefficient of utilization. The light output in lumens from a particular lamp, modified as necessary by depreciation factors, is applied to determine the number of fixtures and the spacing of those fixtures that are necessary to achieve a desired level of illumination. The design process then normally requires changing the number of fixtures to an integral number that lends itself to the space to be illuminated. Reentry of such values as well as different values of illumination levels that are associated with different fixtures allows repeated determinations to optimize the selection of a lighting fixture. A portable calculator that is modified to allow entry of the data described above, the calculation of the number and spacing of lighting units, and recalculation based upon differing inputs, provides a ready solution to the problem of selecting lighting fixtures.
REFERENCES:
patent: 2328456 (1943-08-01), Humphreys
patent: 2517590 (1950-08-01), Mundroff
patent: 4772780 (1988-09-01), Reed et al.
Phillips, Lighting in Architectural Design, pp. 267-284, McGraw-Hill Book Co., New York, 1964.
Cooper Industries Inc.
Cox Elliott
Heim Michael F.
Shaw Dale M.
Thiele Alan
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