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Caltech and The Feynman Lectures Website are pleased to present this online edition of The Feynman Lectures on Physics. Now, anyone with internet access and a web browser can enjoy reading a high-quality up-to-date copy of Feynman8217;s legendary lectures. This edition has been designed for ease of reading on devices of any size or shape; text, figures and equations can all be zoomed without degradation.1
Although far more people could now take photographs, for most of the first half of the twentieth century photography really meant pictures in black and white. Everyone now expects to have colour prints from their holiday a few hours after returning home, but 60 years ago a skilled photographer would take several days, at great expense, to get one colour image on to paper. Reaching today8217;s position called for tremendous research 8211; firstly to establish the best principle on which to base a system of colour photography, and secondly (even more difficult) how to put it into practice so that it was simple, inexpensive and gave high quality results. Hundreds of systems for 8216;natural colour photography8217; were put forward, often by fakers and fraudsters. Fortunes were lost trying to launch processes which only partly overcame problems and contained some fatal flaw. 8230;