The Chicago Police Telephone and Patrol System - p255

doi:10.1038/scientificamerican04231881-255

PDF (652 KB)

Legislating Against Progress - p256

doi:10.1038/scientificamerican04231881-256

PDF (502 KB)

Our City Sewerage - p256

doi:10.1038/scientificamerican04231881-256a

PDF (502 KB)

Permanent Pictures on the Retina - p257

doi:10.1038/scientificamerican04231881-257

PDF (188 KB)

Pickett's Cave - pp257 - 258

H. C. Hovey

doi:10.1038/scientificamerican04231881-257a

PDF (485 KB)

New Cooling Cask - p258

doi:10.1038/scientificamerican04231881-258

PDF (341 KB)

Richard's Registering Barometer - p259

doi:10.1038/scientificamerican04231881-259

PDF (289 KB)

Reversible Tools - p259

doi:10.1038/scientificamerican04231881-259a

PDF (289 KB)

New Game Counter - p259

doi:10.1038/scientificamerican04231881-259b

PDF (289 KB)

Engineering Inventions - p259

doi:10.1038/scientificamerican04231881-259c

PDF (289 KB)

Cane with Toilet Combination - pp259 - 261

doi:10.1038/scientificamerican04231881-259d

PDF (772 KB)

A Mechanical Finger for Use in the Photographing of Engravings - p261

doi:10.1038/scientificamerican04231881-261

PDF (223 KB)

Machine for Grinding Bands on Goblets - p262

doi:10.1038/scientificamerican04231881-262

PDF (281 KB)

Bursting of Fly-Wheels - p262

Geo. M. Hopkins

doi:10.1038/scientificamerican04231881-262a

PDF (281 KB)

A Curious Inhabitant of the Sargasso Sea and Its Nest - p263

doi:10.1038/scientificamerican04231881-263

PDF (317 KB)

Sevres Vase - pp263 - 264

doi:10.1038/scientificamerican04231881-263a

PDF (456 KB)

Ozoniferous Plants - p265

doi:10.1038/scientificamerican04231881-265

PDF (179 KB)

Blackford's Trout Show - p265

doi:10.1038/scientificamerican04231881-265a

PDF (179 KB)