Contents.—First Principles. Lenses. Exposure Influences. Practical Exposure. Development Influences. Practical Development. Cameras and Dark Room. Orthochromatic Photography. Printing Processes. Hand camera Work. Enlarging and Slide Making. Colour Photography. General Applications. Record Applications. Science Applications. Plate Speed Testing. Process Work. Pinhole Photography.
Simple Jewellery. A Practical Handbook with Certain Elementary Methods of Design and Construction. Written for the use of Craftsmen, Designers, Students and Teachers. R. Ll. B. Rathbone. 2nd Edn. In preparation.
Precious Stones. W. Goodchild, M.B., B.Ch. With a Chapter on Artificial Stones by Robert Dykes. With 42 Illustrations. Extra Crown 8vo. 7/6 net.
Contents.—Introduction. Modes of Origin. Physical Properties of Gem Stones. Cutting of Gems. Imitation Gems and the Artificial Production of Precious Stones. Diamond. Fluor Spar. Opal. Corundum. Spinel and Chrysoberyl. Calcite. Labradorite. Beryl. Garnet. Olivine. Sphene. Apatite. Jet. Glossary.
Business and Management.
Advertising: A Study of a Modern Business Power. G. W. Goodall, B.Sc. With an Introduction by Sidney Webb, LL.B. Paper, 1/6.
Storing: Its Economic Aspects and Proper Methods. H. B. Twyford. Author of “Purchasing.” Large Demy 8vo. 21/6 net.
Purchasing: Its Economic Aspects and Proper Methods. H. B. Twyford, of the Otis Elevator Company. 112 Charts, Diagrams and Forms. Large Demy 8vo. 252 pages. 26/- net.
Seasonal Trades. Arnold Freeman, B.A., and Sidney Webb. With a Bibliography of each Trade. 7/6 net.