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. 

ReferencesSchneider, 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