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Features

Improved System for Armored Ships

Cold Quartz-Mining in California

Miscellaneous Summary

The Slide Valve

Inventive Progress--Past and Future

Manufacture of Coal Oil

Improvements in the Arts and Sciences

Want of American Ocean Steamships

Photogeaphy and Printing

Bosses and Workmen

Recent American Patents

A Tour Among the Iron-Clads

Patent Claims

To Our Readers

Rates of Advertising

Improved Lubricator

Departments

  • Departments

    New Books and Publications

  • Notes and Queries

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