Monochromatic lamps and filtered spectra Finish:Stretched Hjõrne is shown wearing a

Hjõrne is shown wearing a shoulder-length wig and a neck-cloth or cravat

surmounted by a view of the Coronation Chair and 15th century stone screen in Westminster Abbey

a faint impression'

Plate 3 from The History and Treatment of the Diseases of the Teeth

Rudolf Caracciola drove this car at 268

Monochromatic lamps and filtered spectra Finish:Stretched Hjõrne is shown wearing aFigures 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