Petrus ab Aggere
Petrus ab Aggere was a Flemish instrument maker and map engraver, whose name is possibly latinized from the Flemish name van Rampaart. He is known as the maker of several mathematical instruments, including sundials, ring dials, astronomical compendia and simple theodolites.

In the late 1500s he worked in Brussels, but a signed instrument from the early 1560s suggests that he was working in Madrid at this point, and an instrument by him in Florence (Epact 29051) specifies Toledo as its place of manufacture.

For instruments by Petrus ab Aggere, see:
   Equinoctial Dial, Signed by Petrus ab Aggere, Madrid, Dated 1562 (Oxford, MHS)
   Theodolite, Signed by Petrus ab Aggere, Toledo, Dated 1560 (Firenze, IMSS)


E. Zinner, Deutsche und Niederl?ndische astronomische Instrumente des 11. bis 18. Jahrhunderts (2nd ed., Munich, 1967), pp. 684; V.A. Rasquin, Dictionnaire des Constructeurs Belges d'Instruments Scientifiques (les origines ? 1914) (Brussels, 1996), p. 19; K. van Cleempoel, "La Produccion de Instrumentos Cientificos en Lovaina en el Siglo XVI", in K. van Cleempoel et al, Instrumentos Cientificos del Siglo XVI: la Corte Espa?ola y la Escuela de Lovaina (Madrid, 1997), pp. 224-5 [p. 137 in the English summary].

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