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Tangent Index Photographs

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Title	Tangent Index Photographs
Subject	Science and Technology Astronomy Inventions
Place	Westerville (Ohio) Franklin County (Ohio)
Description	Early Otterbein professor and amateur astronomer John Haywood invented the tangent index. The first two photographs depict different angles of the tangent index. The third image includes the index with a "Day and Night Apparatus." "By the aid of this new instrument, the phenomena of the day and night corresponding to the apparent diurnal motion of the sun, can be exhibited to a class in all their variations." These photographs measure 4.2" by 6.5" (10.9 by 16.5 cm). John Haywood (1825-1906) graduated from Oberlin College in 1850 and began teaching mathematics and natural sciences at Otterbein University in 1851. He surveyed the streets of Westerville and became the first mayor when the village was incorporated in 1858, but only served until the spring election of 1858. Haywood kept the official records on the weather conditions in the Westerville vicinity including temperature, rainfall, barometric pressure, wind velocity, and humidity. He also introduced the metric system to the area and provided meters for measuring cloth to local merchants to encourage its adoption. Haywood was also a keen amateur astronomer and the inventor of the tangent index. "By the aid of this new instrument, the phenomena of the day and night corresponding to the apparent diurnal motion of the sun, can be exhibited to a class in all their variations." He was a beloved local figure and after his retirement, he was known as the "Grand Old Man of Otterbein."
Date of Original	1880 circa
Collection	John Haywood Collection
Source	Audiovisual material
Submitting Institution	Otterbein College
Type	StillImage
Format	picture

Title	Om2057_1894264_042
Rights	For rights and reproduction requests, go to the Ohio Historical Society's Audiovisual and Graphic Reproduction Services page at http://www.ohiohistory.org/resource/audiovis/photodup.html; Online access is provided for research purposes only. For rights and reproduction requests or more information, go to http://www.ohiohistory.org/images/information
File Name	Om2057_1894264_042.tif
Image Height	1957
Image Width	1258
File Size	906.272 KB

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Tangent Index Photographs

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