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 |