DMM 15991

Museum: Deutsches Museum, Munich

Title: Sector by Chevalier

Inventory number: DMM 15991

Signature: "Chevalier Ing.r Quai de l'horologe N°69 à Paris"

Date: End of 18./beginning of 19. century

Material: Brass

Dimensions: Lenght of limb: 166 mm; width: 15 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). Two other scales, each on a face, when the sector is opened at 180 degrees, on the border. "P. des boulets", side of the metallic scale. "C. des pieces", other side. These two scales have very few values, compared to other sectors. 

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

Maurice, Daumas: Les instruments scientifiques aux XVIIe et XVIIIe siecle. Paris, 1953, p. 377.

Measurements of Scales (in mm)

"Les Metaux"

☉ [Sun, Gold]

118,5
[lead, symbol is absent] 140

☽ [Moon, Silver]

145

♀ [Venus, Copper]

152

♂ [Mars, Iron]

158

♃ [Jupiter, Tin]

162

"P. des boulets"

4 81,5
8 102,5
12 117,5
16 129
24 147

"C. des pieces"

4 84
8 106
12 121
16 134
24 152,5