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Regulating Water Level in Steam Boilers - p148
doi:10.1038/scientificamerican01211854-148a
Proportions of Vessels-Large Ships for Long Voyages - p148
doi:10.1038/scientificamerican01211854-148i
Writing Pencil-Something to be Invented - p148
doi:10.1038/scientificamerican01211854-148j
Reform of the Patent Laws—Fees for Foreigners—Extension of Patents—The New Rule - p149
doi:10.1038/scientificamerican01211854-149
Report on Lubricating Oils in the Crystal Palace - p150
doi:10.1038/scientificamerican01211854-150a
Experiments with Rotary Engines at the Crystal Palace - p150
doi:10.1038/scientificamerican01211854-150b
Elevated Promenade and Railroad for Broadway - p152
doi:10.1038/scientificamerican01211854-152
