Some photometrical measurements [microform]
A 1904 Toronto scholarly study of photometry and colour by W. G. Smith, issued by the University Library and preserved as a microform scan. Its one plate shows two stacked photographic test frames, each holding a black and white image of a scene with a sharp dark tonal range, captioned Plate C, offering a designer a study in contrast, tonal value and high-key versus low-key exposure.
![Picture 1 of 1 from Some photometrical measurements [microform] (1904), leaf 13](https://img.insideoutlibrary.com/img/200/ia-cihm_991340-13-0.webp)