Monochromatic lamps and filtered spectra Size:XXL: 150 x 100cm Fourth gear gave good acceleration

Fourth gear gave good acceleration and flexibility

St Giles-in-the-Fields

better known as Twiggy

British ska group Madness pose at a photocall

Barbra Streisand

Monochromatic lamps and filtered spectra Size:XXL: 150 x 100cm Fourth gear gave good accelerationFigures showing monochromatic lamps fuelled by alcohol diluted in water to produce a yellow flame (figures 1 3), with views of the effects on the spectrum created by filtering light through various types of coloured glass (figure 4 numbers 1 16). Plate 28 from the paper 'Description of a monochromatic lamp for microscopical purposes, &c. with remarks on the absorption of the prismatic rays by coloured media.', by David Brewster, originally published