Revised formula for luminosity curve solution for physical photometry

✍ Scribed by Herbert E. Ives

• Publisher: Elsevier Science
• Year: 1918
• Tongue: English
• Weight: 92 KB
• Volume: 186
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(18)90858-6

✦ Synopsis

SINCE the publication of a luminosity curve solution formula by Ires and Kingsbury, a large number of measurements have been made by Crittenden and Richtmyet ~, by the visual (flicker) photometric method taken as the criterion in .the writer's physical photometric studies. The result of this work of Crittenden and Richtmyer is to lead to a slightly different choice of composition for'the .test color solutions, which over a "4-watt " lamp should measure equal by the average eye. The originally published and revised test colors are : Original Revised CUSO,...53 grams to I liter of water CUSO,...57 grams to I liter of water K,Cr,O~..72 grams to I liter of water K,Cr20~..72 grams to I liter of water This change corresponds to a change of two per cent. in the relative transmissions.

In6rder to meet this new test color composition the luminosity curve solution formula has been empirically changed to give the ratio unity in the physical photometer, as follows: