Calendar: 1860-1861 Page 136

APPLIED SCIENCES 137 which the fee is 31 3s to be paid in the office of the College The fee for Private Instruction is 51 5s for six Lessons or 10 10i for perpetual attendance The following is Syllabus of the Course of Lectures THEORY OP PHOTOGRAPHIC PROCESSES The Salts of Silver employed in Photography-their Nature and Properties-Illustrations of their relative Sensibility to the direct Action of Light-Experiments showing the accele- rating Action of Organic Matters &c -Explanation of the Changes Phenomena of the Development of an Invisible Image -Illus- trations of Molecular Changes-Μ user's Experiments-Reduc- tion of Oxides to the Metallic State Photographic Action of Coloured Light -Blue Red and Yellow Glasses-Flowers of Various Tints-Surface Reflection of White Light APPARATUS AND CHEMICALS The Camera -Rigid and Folding Cameras-Swinging Backs -Fowkes's Portable Camera Lenses -The Double Combination-the Single Achr ttic Lens-Use of Diaphragms Collodion Its Nature and Mode of Preparation-Varieties of Pyroxyline-Glutinous and Fluid Collodion-the Iodizing Solution-Explanation of Changes which ensue on mixing The Nitrate Bath -Purification of Commercial Nitrate of Silver-Mode of Saturating with Iodide-Use of Litmus Papers for Testing Developing Solutions -Protonitrate of Iron for Positives- Sulphate of Iron-Pyrogallic Acid-Mode of testing Purity of Water and of separating Lime Salts when present THE POSITIVE PROCESS ON GLASS Cleaning the Glasses -With old Collodion-with Tripoli and Ammonia-with Nitric Acid to remove Iron Stains Preparing the dark Room -Its Illumination by Yellow Light -Arrangement of Apparatus