DMM 45965

Museum: Deutsches Museum, Munich

Title: Sector

Inventory number: DMM 45965

Date: To be established.

Material: Brass

Dimensions: Lenght of limb: 157 mm; width: 16 mm.

Description: See Schneider, 1970, p. 91.

Preliminary examination of the metallic scales: No inscription about instrument maker. Planetary symbols on the metal scale, indicated a "les Metaux". It seems like good workmanship. Two other scales, unusually on the two external faces of the limb, and not on the bottom of the limb. Not seen in any other exemplar. "Diamettres et poids des boulets" and "Calibres des Piecs". Quite large fonts, a digit is about 2,5mm high. 

ReferencesSchneider, Ivo: Der Proportionalzirkel: Ein universelles Analogrecheninstrument der Vergangenheit. Deutsches Museum: Abhandlungen und Berichte. 38. Jahrgang 1970, Heft 2. München, Düsseldorf 1970, p. 91.

Measurements of Scales (in mm)

"les Metaux"

☉ [Sun, Gold]

109

♄ [Saturn, Lead]

129

☽ [Moon, Silver]

134

♀ [Venus, Copper]

139,5

♂ [Mars, Iron]

146

♃ [Jupiter, Tin]

149

"Diamettres et poids des boulets"

1/2 37,5
1 51
[2] 64
[3] 74
[4] 81
5 87
[6] 93
[7] 98
[8] 103
[9] 107
10 110
[11] 113,5
[12] 117
[13] 120
[14] 123
15] 126
[16] 129
[17] 131,5

"Calibres des Piecs"

1/2 40
1 54
[2] 67,5
[3] 78
[4] 85
5 92
[6] 98
[7] 103
[8] 108
[9] 112
10 116
[11] 120
[12] 123,5
[13] 127
[14] 130
15] 133
[16] 136
[17] 138
[18] 141
[19] 143
20 146
[21] 148,5
[22] 150