The success which has attended the publication of ‘Spons’ Dictionary of Engineering’ has encouraged the Publishers to use every effort tending to keep the work up to the standard of existing professional knowledge. As the Book has now been some years before the public without addition or revision, there are many subjects of importance which, of necessity, are either not included in its pages, or have been treated somewhat less fully than their present importance demands. With the object, therefore, of remedying these omissions, this Supplement is now being issued. Each subject in it is treated in a thoroughly comprehensive way; but, of course, without repeating the information already included in the body of the work.

The new matter comprises articles upon


NOW COMPLETE.

With nearly 1500 illustrations, in super-royal 8vo, in 5 Divisions, cloth. Divisions 1 to 4, 13s. 6d. each; Division 5, 17s. 6d.; or 2 vols., cloth, £3 10s.

SPONS’ ENCYCLOPÆDIA
OF THE
INDUSTRIAL ARTS, MANUFACTURES, and COMMERCIAL PRODUCTS.
Edited by C. G. WARNFORD LOCK, F.L.S.

Among the more important of the subjects treated of, are the following:—