LOC's Public Domain Archive
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![Espy's patent conical ventilator. [Description of] James P. Espy. Washington 1842.](https://cache.getarchive.net/Prod/thumb/cdn18/L3Bob3RvLzIwMTkvMTAvMDcvZXNweXMtcGF0ZW50LWNvbmljYWwtdmVudGlsYXRvci1kZXNjcmlwdGlvbi1vZi1qYW1lcy1wLWVzcHktd2FzaGluZ3Rvbi0xODQyLWE2ODU5MC0xMDI0LmpwZw%3D%3D/40/46/webp "Espy's patent conical ventilator. [Description of] James P. Espy. Washington 1842.")