Important Technical Publications: Protective Coatings to Metals dealt with in a British and an American Book, and a Standard Work on Aircraft Instruments Available to Purchase

“Metal Spraying. The Origin, Development, and Applications of the Metal‐Spray Process.”. By T. Henry Turner and N. F. Budgen. [Charles Griffin & Co., London, 1926.] [This book was referred to in a letter to the Editor printed on page 15 of our January issue. Although it was published nearly four years ago, in view of the present interest in the subject we think it not too late to bring it to the notice of our readers.—EDITOR.]