Photometry Concordance
Photometry
Section titled “Photometry”Concordance status: generated from processed OCR/PDF text. Treat these as source-location aids until each passage is checked against the scan.
58 hits
Total text matches across processed Steinmetz sections.
2 sources
Sources containing at least one matched alias.
4 sections
Chapters, lectures, sections, or report divisions with matches.
Matched Aliases
Section titled “Matched Aliases”Photometry, photometer, photometers, photometric, photometry
Source Distribution
Section titled “Source Distribution”| Source | Hits | Sections |
|---|---|---|
| Radiation, Light and Illumination | 54 | 3 |
| General Lectures on Electrical Engineering | 4 | 1 |
Section Hits
Section titled “Section Hits”| Section | Source | Hits | Workbench | Location |
|---|---|---|---|---|
| Lecture 9: Measurement Of Light And Radiation | Radiation, Light and Illumination | 46 | Workbench | lines 8511-9388 |
| Lecture 17: Arc Lighting | General Lectures on Electrical Engineering | 4 | Workbench | lines 9920-12795 |
| Lecture 3: Physiological Effects Of Radiation | Radiation, Light and Illumination | 4 | Workbench | lines 2366-3638 |
| Lecture 12: Illumination And Illuminating Engineering | Radiation, Light and Illumination | 4 | Workbench | lines 16485-17445 |
Representative Source Snippets
Section titled “Representative Source Snippets”Lecture 9: Measurement Of Light And Radiation - 46 hit(s)
Open source text | Open chapter workbench
... compare physiological effects of widely different wave lengths by comparing the power required to produce them. When speaking of mechanical equivalent of light, it thus must be understood in the extended meaning of the word, as discussed above. 76. In photometry, and in general in illuminating engineer- ing, it is of essential importance to keep in mind this difference in the character of light, as physiological effect, and radiation, as physical quantity of power. This is the reason why all attempts to reduce ph ...Lecture 17: Arc Lighting - 4 hit(s)
Open source text | Open chapter workbench
... light of the same color we can compare exactly; if the color is not much different, we still get an approximate comparison; but with widely different colors, we obviously can not get even an approximate com- parison, can not say when the two sides of the photometer screen, one illuminated by green light, the other by red light, are equal in intensity. There is thus no direct comparison of differently colored lights. You have then to go one step farther and consider that light is used for illumination, is used to see ...Lecture 3: Physiological Effects Of Radiation - 4 hit(s)
Open source text | Open chapter workbench
... in the middle of the spectrum. When comparing, however, the physiological effects of different frequencies of radiation, that is, different colors of light, the diffi- culty arises that different colored lights cannot be compared photometrically, as all photometers are based on making the illu- mination produced by the two different sources of light equal, and when these sources of light are of different color they can never become equal. As long as the colors are not very different - two different shades of yellow ...Lecture 12: Illumination And Illuminating Engineering - 4 hit(s)
Open source text | Open chapter workbench
... bution curve obviously is to choose a light source coming as near to it as possible, and then modifying it by reflection or diffraction. 113. Thus far, the problem is one of physics, and the result, that is, the objective illumination, can be measured by photometer or luminometer, and thus checked. The duty of the illuminat- ing engineer, however, does not end here, but with the same objective illumination, that is, the same distribution of light flux throughout the entire illuminated area, as measured by photomete ...