Calendar: 1866-1867 Page 140

140 APPLIED SCIENCES first or second year may by permission of the Dean attend on payment of fee of 41 3s per Term The following is general outline of the course The Salts of Silver employed -Their Nature and Properties -the Action of Light upon them and the changes thereby produced-Phenomena of the Development of an Invisible Image-Varied action of Coloured Lights Camera -Different forms of Lenses-Their Construction and Adaptability for special purposes Collodion-The Nature of and Mode of Preparation The Nitrate of Silver Bath-Its preparation the Disorders to which it is liable and the method of treating them Developing Solutions-Their action explained Fixing Solutions-Why necessary and the reactions which take place Varnishes -Their application The Dark Room and Glass House -The principles on which they should be constructed-Arrangement of Chemicals and Apparatus Negative and Positive processes in Glass -Manipulations con- nected with explained and illustrated by practical demonstra- tions Photographic Printing -Theory of Direct Printing on Paper -Toning and Fixing of Prints explained-Practical Demon- strations of the Process both on Glass and Paper-Causes of Fading of Photographs-Mounting of Prints Collodion Dry Processes -Their comparative Merits explained and illustrated-Practical details of Photographic Manipulations -These are conducted by the Students themselves under the superintendence of the Lec- turer and they comprehend the whole course of Photographic practice Defects of manipulation reaction of impure che- micals symptoms of over and under exposure and in short the multitudinous causes of failure in photography are pointed out as tbey occur and the best means of avoiding them are explained