Subject: Engineering

Congressional Record report to the Secretary of War, 42nd Congress, 2nd Session. The Hallmark Report details the famous Sutro Tunnel in Nevada, designed to save the Comstock Lode. Originally approved by Congress on July 1866. This is the final Congressional report before the project commenced. Dated January 7, 1872.

This issue of *Scientific American*, dated February 10, 1866, features a full-page article with illustrations on Solomon Nunes Carvalho's apparatus for super-heating steam. The article details the design and functionality of Carvalho's invention, likely providing technical specifications and diagrams. This periodical offers insight into 19th-century engineering and the contributions of a prominent Jewish inventor.