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Excerpt from Electric Lamps and Electric Lighting: A Course of Four Lectures on Electric Illumination Delivered at the Royal Institution of Great Britain
Electric lighting in Great britain.-a Glance Backward over Fourteen Years. - Present Condition of Electric Lighting -an Electric Current. - Its Chief Properties. - Heating Power. - Electrical Resistance. Names of Electrical Units. - Chemical Power of an Electric Current. Hydraulic Analogies. - Electric Pressure. Fall of Electric Pressure down a Conductor. - Ohm's Law. - Joule's Law. - Units of \vork and Power. - The Watt as a Unit of Power. - Incandescence of 8. Platinum wire.-spectroscopic Examination of a Heated Wire. - Visible and Invisible radiation.-luminous E¿iciency. - Radiation from Bodies at Various Temperatures. - E¿iciency of Various Sources of Light. - The Glow Lamp and Are Lamp as Illuminants. - Colours and Wave Lengths of Rays of Light. - Similar and Dissimilar Sources of Light. -colour-distinguishing Power. - Causes of Colour. - Comparison of Brightness and Colour. - Principles of Photometry. - Limitations due to the eye.-luminosity and Candle-power. Standards of Light. Standards of Illumination. - The Candle-foot. - Comparison of Sun light and Moonlight. - Comparison of Lights. - Ritchie's Wedge. Rumford and Bunsen Photometers. Comparison of Lights of Different Colours. Spectro-photometers. - Results of Investigations.
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