Testing Boilers by Hydrostatic Pressure. Uniformity in Mails. 'Up a Mountain by Rail. Vegetable Cutter. Epergnes for Fruits and Flowers. Spread of Small Pox by Contagion., scientific american, 1871-09-30


Testing Boilers by Hydrostatic Pressure. Uniformity in Mails. 'Up a Mountain by Rail. Vegetable Cutter. Epergnes for Fruits and Flowers. Spread of Small Pox by Contagion., scientific american, 1871-09-30


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