The Seven Ages of Our World - pp400 - 401

doi:10.1038/scientificamerican06251892-400

PDF (540 KB)

An Improved Ballot Box - p402

doi:10.1038/scientificamerican06251892-402

PDF (250 KB)

Intelligence of Parrots - p402

doi:10.1038/scientificamerican06251892-402a

PDF (250 KB)

An Improved Hose Coupling - pp402 - 403

doi:10.1038/scientificamerican06251892-402b

PDF (488 KB)

A Simple Camera Shutter - p403

doi:10.1038/scientificamerican06251892-403

PDF (262 KB)

The Shely Fiber Breaker - pp403 - 404

doi:10.1038/scientificamerican06251892-403a

PDF (447 KB)

Sheeley's Canning or Preserving Jar - p404

doi:10.1038/scientificamerican06251892-404

PDF (198 KB)

From Chaos to Man - pp405 - 407

Garrett P. Serviss

doi:10.1038/scientificamerican06251892-405a

PDF (1,237 KB)

The Chronograph - p407

doi:10.1038/scientificamerican06251892-407

PDF (298 KB)

Improved Punching and Shearing Machine - p407

doi:10.1038/scientificamerican06251892-407a

PDF (298 KB)

To Inventors - p409

doi:10.1038/scientificamerican06251892-409

PDF (618 KB)