DMM 73861

Museum: Deutsches Museum, Munich

Title: Sector

Inventory number: DMM 73861

Date: To be established.

Material: Brass

Dimensions: Lenght of limb: 32,2 cm; width of limb: 3,2 cm

Description: See Schneider, 1970, p. 78. 

Preliminary examination of the metallic scales: Metallic Line. Plus two other scales for Lead and Iron (of the cubic type). These scales have two explicit values, "10" and "5", the others are indicated by dots. Note that the "u" in "Plu" as a macron for an abbreviation. Note: the value for "Lap: Vulg:" has not a dot. I measured it where the dot should be.

References: Ivo Schneider: Der Proportionalzirkel: Ein universelles Analogrecheninstrument der Vergangenheit. Deutsches Museum: Abhandlungen und Berichte. 38. Jahrgang 1970, Heft 2. München, Düsseldorf 1970, p. 78-9.

Measurements of Scales (in mm)

Metallic Line

Aur: 138
Hyd: 146
Pl[u]: 160
Arg: 168
Cup 175
Stan [1st value] 182
Stan [2nd value] 185,5
Ferr: 186,5
Marm 259
Lap: Vulg: 289

 Scales for Iron and lead.

Ferr: Plum:
10 107,5 92,5
[9] 104 89
[8] 100 86
[7] 95,5 82
[6] 90,5 78
5 85 73
[4] 79 68
[3] 72 61,5
[2] 63 54
[1] 50 43