DMM 49584
Museum: Deutsches Museum, Munich
Title: Sector by Michael Butterfield
Inventory number: DMM 49584
Signature: "Butterfield AParis" ["A" merges with "P"] note the "tt" in "Butterfield".
Date: Between 1635 - 1724
Material: Brass
Dimensions: Lenght of limb: 166 mm; width: 16 mm.
Description: See Schneider, 1970, p. 88.
Preliminary examination of the metallic scales: The front presents a metallic line with 6 values. Planetary symbols on the metal scale, indicated a "Les Metaux". Note that the symbol for iron comes before the symbol for copper. This is a big anomaly (or error?). Two other scales, each on a face, when the sector is opened at 180 degrees, on the border. These scales have no label and will be indicate here as scale A (the one on the side of the metallic line) and scale B.
References: Schneider, Ivo: Der Proportionalzirkel: Ein universelles Analogrecheninstrument der Vergangenheit. Deutsches Museum: Abhandlungen und Berichte. 38. Jahrgang 1970, Heft 2. München, Düsseldorf 1970, p. 88.
Measurements of Scales (in mm)
"Les Metaux"
☉ [Sun, Gold] |
119 | |
♄ [Saturn, Lead] |
140 | |
☽ [Moon, Silver] |
145,5 | |
♂ [Mars] [!] |
152 | |
♀ [Venus] |
158 | |
♃ [Jupiter, Tin] |
162,5 |
Scale A (on the same side of metallic line)
4 | 82 |
8 | 103 |
12 | 118 |
16 | 120 |
24 | 148 |
Scale B
4 | 85 |
8 | 107 |
12 | 122 |
16 | 134,5 |
24 | 153 |