DMM 53733

Museum: Deutsches Museum, Munich

Title: Sector

Inventory number: DMM 53733

Date: To be established.

Material: Brass

Dimensions: Lenght of limb: 115 mm; width: 12 mm.

Description: See Schneider, 1970, p. 90. 

Preliminary examination of the metallic scales: Planetary symbols on the metal scale, indicated as "les Metaux". Lead symbol is absent, but the scal line is present. Engraving is very poor. Two other scales, each on a face, when the sector is opened at 180 degrees, on the border, with no titles. These two scales have very few values, compared to other sectors. Overall, it looks like a cheap instrument. 

References: Schneider, 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"

Scale on the side of the metallic line

Scale on the other side