DMM 18760

Museum: Deutsches Museum, Munich

Title: Sector by Michael Butterfield

Inventory number: DMM 18760

Signature: "Buterfield AParis" ["A" merges with "P"]

Date: Between 1635 - 1724

Material: Brass

Dimensions: Lenght of limb: 165 mm; width: 15 mm.

Description: See Schneider, 1970, p. 88. 

Preliminary examination of the metallic scales: Very rough manufactured. Planetary symbols on the metal scale, indicated a "Les Metaux". Two other scales, each on a face, when the sector is opened at 180 degrees, on the border. Called respectively "poides des boulets" [sic] and "Calibre des pies" [sic].

Very similar to Bion DMM 62678 and DMM 63898, but note that that in DMM 62678 and DMM 63898 the scale "Poids des boulets" is on the same side of the scale of metals, while in DMM18760 the "Calibre des pies" is on that side.

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]

117

♄ [Saturn, Lead]

139

☽ [Moon, Silver]

144

♀ [Venus, Copper]

150

♂ [Mars, Iron]

156

♃ [Jupiter, Tin]

160

"Calibre des pies"

1/4 33
1/2 42
3/4 48
1 53
2 66
4 84
6 96
8 106
10 114
15 120,5
20 133
25 139
30 148
35 158
40 164
45 181
50 192
55 200
60 211

"poides des boulets"

1/4 31
1/2 40
3/4 45
1 51
2 64
4 80
6 92,5
8 11,5
10 109
15 114
20 128
25 138
30 146
35 152
40 163
45 173
50 184
55 192
60 202