The attachment of devices to the eyepiece of a microscope is a long accepted practice among microscopisis; almost as soon as a new technical advance appears, someone is adapting it to the study of microscopic specimens. Photomicrography was in use from almost the earliest days of photography, while the microspectroscope was developed and described by Sorby as early as the 1860's. As advances in technology provided improved means for recording data and collecting radiation invisible to the human eye, these were rapidly adapted to the microscope as add-on accessories constructed as one-of-a-kind instruments or in a few cases as commercial products.