Page from a letter from Fr. Heinrich Maderson S.J. to Athanasius Kircher (apograph), Münster, 29 January 1643, APUG 557 fol. 40r. Copyright of the Pontificia Università Gregoriana.

This image is a JPEG compression of an original TIF file of approximately 14 MB. The JPEG image has been further reduced in size (and quality) to facilitate viewing on the web. For an enlargement of the highlighted part of the letter click here.

The letter displayed, from one of Kircher's many Jesuit correspondents, describes techniques for calibrating various types of sundial.

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