DMM 12656

Museum: Deutsches Museum, Munich

Title: Sector

Inventory number: DMM 12656

Date: To be established.

Material: Brass

Dimensions: Lenght of limb: 158 mm; width: 13 mm.

Description: See Schneider, 1970, p. 90.

Preliminary examination of the metallic scales: Planetary symbols on the metal scale, indicated a "Les Metaux". Lead symbol is absent, but the scal line is present (see picture). Depiction of the line is not very sophisticated. Two other scales, each on a face, when the sector is opened at 180 degrees, on the border. "P des B", side of the metallic scale. "C des P", on other side. These two scales have very few values, compared to other sectors. Overall, it looks like a cheap instrument. 

ReferencesSchneider, Ivo: Der Proportionalzirkel: Ein universelles Analogrecheninstrument der Vergangenheit. Deutsches Museum: Abhandlungen und Berichte. 38. Jahrgang 1970, Heft 2. München, Düsseldorf 1970, p. 90.

Measurements of Scales (in mm)

"Les Metaux"

☉ [Sun, Gold]

116,5
[lead, symbol is absent] 137,5

☽ [Moon, Silver]

142,5

♀ [Venus, Copper]

150

♂ [Mars, Iron]

155

♃ [Jupiter, Tin]

158

"P des B"

4 80,5
8 102
12 116,5
16 129
24 146

"C des P"

4 83
8 105
12 120
16 132
24 150