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![]() Nocturnal And Sundial The handle on this side is engraved, 'Horometri tergum in quo uerus solis locus singulis diebus prope uerum col ligere licet cum aspectibus'. The sundial side has a Regiomontanus-type altitude dial with sight vanes with double pin-holes, and a three-element articulated arm for adjusting the point of suspension of the plumb-line (missing) on the triangular grid of latitude and zodiacal position. The zodiacal symbols are at the top, with each sign divided by three, and the beginning of each sing indicated by broken lines running through the grid; the latitude scale in from 0 to 65, divided to 5, 5 to 65 subdivided to 1, numbered by 5. The grid is marked on one side, 'Zodiaci Latitudinum Scala', and on the other 'Zodiaci latitudinum quae et poli eleuatio siue borei siue noctii'. The hour lines are numbered both [0] to 12, 'Horae ante meridianae', and 12 to 1 and 12, 'Horae pomeridianae'. There is a solar declination scale to the right of the hour lines, marked with zodiac symbols, each sign divided by three, this scale and the mid-day hour line being marked 'Generalis zodiac<us> et meridianus'. The midnight line is marked 'Medium noctis Septentrio'. The instrument is marked 'QVADRATVM HORARVM GENERALE'. Around the edge of the sundial side are two altitude scales to be used with the sights and the suspension point set to a position marked 'Centrum Quader'. The outer is a scale of degrees radiating from this point, 0 to 90, divided to 5, subdivided to 1, numbered by 5, marked 'Quaderans Astronomicus'. The inner is a geometrical quadrant or shadow-square scale, 0 to 60 to 0, divided to 5, subdivided to 1, numbered by 5, marked, 'Quaderans Geometricus' and 'VMBRA VERSA' and 'VMBRA RECTA'. Signed 'VDALRICVS SHNIEP MONACHY' and '15 VS 81'. The handle on this side is engraved, 'Horometrifaci es ad omnem regionum latitudinem tam Borealem quam Australem', beneath which is 'R[?]VS'. E. Zinner, Deutsche und Niederl?ndische astronomische Instrumente des 11. bis 18. Jahrhunderts (2nd ed., Munich, 1967, p. 525. Jim Bennett |