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Features

Roesler's Improvement in Match Safes

Askwith's Improved Piston Packing

Improved Combined Mortising and Boring Machine, Sulphurized Paper

Ancient Locks and Keys

Heat and Cold

By John Tyndall

Sketches from the Paris Exhibition

The Wheel Question

Editorial Summary

Manufacturing, Mining, and Railroad Items

Recent American and Foreign Patents

Answers to Correspondents

New Publications

Gregory & Melotte's Patent Adjustable Clutch

Wanzer's Harvester Pitman Connection

Riordan's Clothes Line Holder

On Forging, Hardening, and Tempering Mill Picks

Popularize Science

Utilization of Waste

Aluminum Bronze--Its Properties and Uses

Wrought-Iron Fences--Setting Iron Fence Posts

Patents and Claims

Issued by the United States Patent Office

Extension Notices

1868 Scientific American the Best Paper in The World

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Why Do Facts Fail?

Why Do Facts Fail?

Deconstructing Denial