DMM 38939
Museum: Deutsches Museum, Munich
Title: Sector by Michael Butterfield
Inventory number: DMM 38939
Signature: "Buterfield a paris."
Date: Between 1635 - 1724
Material: Brass
Dimensions: Lenght of limb: 110 mm; width: 13 mm
Description: See Schneider, 1970, p. 88.
Preliminary examination of the metallic scales: The front presents a metallic line with 6 values. Planetary symbols on the metal scale, indicated a "Les Metaux". Two other scales, each on a face, when the sector is opened at 180 degrees, on the border. Called respectively "poi des boulets" [sic] and "Calibre des pies" [sic].
References: Schneider, Ivo: Der Proportionalzirkel: Ein universelles Analogrecheninstrument der Vergangenheit. Deutsches Museum: Abhandlungen und Berichte. 38. Jahrgang 1970, Heft 2. München, Düsseldorf 1970, p. 88.
Maurice, Daumas: Les instruments scientifiques aux XVIIe et XVIIIe siecle. Paris, 1953, p. 107f.
Measurements of Scales (in mm)
"Les Metaux"
☉ [Sun, Gold] |
79 | |
♄ [Saturn, Lead] |
93 | |
☽ [Moon, Silver] |
97 | |
♀ [Venus, Copper] |
101,5 | |
♀ [repeats the Venus symbol, but it is iron] |
105 | |
♃ [Jupiter, Tin] |
108 |
"Calibre des pies"
1/4 | 34 |
1/2 | 41 |
3/4 | 47 |
1 | 51 |
2 | 65 |
4 | 81,5 |
6 | 93 |
8 | 103 |
10 | 110 |
15 | 116 |
20 | 128 |
25 | 138 |
30 | 147 |
35 | 153 |
40 | 164 |
45 | 175 |
50 | 185,5 |
55 | 194 |
60 | 205 |
"poi des boulets"
Note: the first two points for 1/4 and 1/2 are poorly indicated. I assume that the line of the scale corresponds to the line of the fraction.
1/4 | 34 |
2 [1/2] | 40 |
3/4 | 45 |
1 | 51 |
2 | 65 |
4 | 82 |
6 | 94,5 |
8 | 104 |
10 | 112 |
15 | 119 |
20 | 131,5 |
25 | 142 |
30 | 151 |
35 | 157 |
40 | 168 |
45 | 179 |
50 | 191 |
55 | 199 |
60 | 210 |