โ Scribed by Walter M. Berry; I.V. Brumbaugh; G.F. Moulton; G.B. Shawn
No coin nor oath required. For personal study only.
temperature of the source (conforming to the Planckian energy distribution) that evokes the sensation of gray is about 52oo ยฐ K. The centre of gravity of this light distribution is 56o.4 millimicrons, or approximNely the same as average noon sunlight. The results are compared with previously proposed standards for .average daylight.
This investigation can be regarded only as preliminary, due to the small number of observers concerned. But the " method of :answers " has been demonstrated as perfectly reliable, and there seems no reason why, with a greater number of observers, the problem of a standard of white may not be solved.
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