AN EDITORIAL INTRODUCTION, WITH, EXPLANATIONS OF PRAC- COMPILED AND EDITED BY JOHN L. KINGSLEY, C. E. AND JOSEPH P. PIRSSON, C. E. PATENT AGENTS, Editors and Publishers of the " Eureka, or the National Journal of Inventions, |
AN EDITORIAL INTRODUCTION, WITH, EXPLANATIONS OF PRAC- COMPILED AND EDITED BY JOHN L. KINGSLEY, C. E. AND JOSEPH P. PIRSSON, C. E. PATENT AGENTS, Editors and Publishers of the " Eureka, or the National Journal of Inventions, |