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New Balanced Slide Valve
1883
Scientific American
Umbrellas as commonly made are provided with a central staff and with braces converging toward the staff, the entire arrangement preventing the head from being placed in any thing like a ceutral position under the top, and of course the umbrt:lla does not afford the protection it should. The engraving shows an umbrella provided with a sup port formed of four rods pivoted to each other at the ends, the upper euds of the upper rods being pivoted to the middle of the umbrella top frame, and the
doi:10.1038/scientificamerican09151883-166c
fatcat:hvb7izvj5neypnjuu7yquzwrha