1. Observations on light and colors, Essays Observ;Melvill;Phys Lit Edinburgh,1756
2. A method of examining refractive and dispersive powers;Wollaston;Philos Trans R Soc London,1802
3. On the absorption of light by coloured media;Herschel;Trans R Soc Edinburgh,1823
4. Some experiments on colored flames;Talbot;Edinburgh J Sci,1826
5. Chemical analyses by means of spectral observations;Kirchhoff;Ann Phy (Leipzig),1860