Foreword
NBS Circular 478, Colorimetry, was issued 1 March 1950 and has been reprinted several times in response to a continuing demand. Such have been the advances in colorimetry that in 1965, instead of authorizing another reprinting of a work obsolete in many details, I asked Mr. I. Nimeroff to up-date it. I am grateful to him for undertaking this tedious but important task, and I am much pleased with the result.
Deane B. Judd
Assistant Division Chief,
Metrology Division
II
