Chemical Compounds Made by Compression. By M. W. SPRING.
6452
Copper Alloys among the Ancients. By Prof. E. REYER.--A
valuable and important paper, full of useful information,
showing the geology of the metals.--Characteristics of
copper alloys, with tables showing constituents used in
different countries.--Casting the alloys.--Hard bronze of
the ancients.--Summary of alloys used by the ancients 6452
II. ENGINEERING AND MECHANICS.--Bietrix's Vertical and
Compound Engine.--With description and numerous figures 6439