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Signature	Maker	Instruments	Comments	Location	References
HOLTZHEY, JOHANN KONRAD	Germany, fl.1719-31, MIM	Sundial Plate and Universal Sundials = Uffenbach Coll., U. of Göttingen.	one of the universal sundials is of cardboard and is inscribed "Heliotropicum gnomonicum, Ulm, 1720"; author; designer.	Ulm.	Zinner 1.
HOLTZHEY, JOHANN KONRAD	Germany, fl.1719-31, MIM	Sundial Plate and Universal Sundials = Uffenbach Coll., U. of Göttingen.	one of the universal sundials is of cardboard and is inscribed "Heliotropicum gnomonicum, Ulm, 1720"; author; designer.	Ulm.	Zinner 1.

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