DMM 34926
Museum: Deutsches Museum, Munich
Title: Sector by Lenoir
Inventory number: DMM 34926
Signature: "Lenoir a Paris"
Date: To be established.
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". Engraving is much better quality than DMM 15991 and DMM 12656. Two other scales, each on a face, when the sector is opened at 180 degrees, on the border, "Poids des Boulets" (side of metallic scale) and "Calibre des Pieces", in rather small fonts (the "C" is about 2,5mm high).
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.
Maurice, Daumas: Les instruments scientifiques aux XVIIe et XVIIIe siecle. Paris, 1953, p. 363 f.
Measurements of Scales (in mm)
"Les Metaux"
☉ [Sun, Gold] |
119 | |
♄ [Saturn, Lead] |
140 | |
☽ [Moon, Silver] |
145,5 | |
♀ [Venus, Copper] |
152 | |
♂ [Mars, Iron] |
158 | |
♃ [Jupiter, Tin] |
162,5 |
"Poids des Boulets"
1/4 | 32 |
1/2 | 41 |
3/4 | 46,5 |
1 | 51 |
2 | 64,5 |
3 | 74 |
4 | 81 |
5 | 87,5 |
6 | 93 |
7 | 98 |
8 | 107 |
10 | 110 |
12 | 117 |
14 | 123,5 |
16 | 129 |
18 | 134 |
20 | 139 |
22 | 143,5 |
24 | 148 |
27 | 153,5 |
30 | 159 |
33 | 164,5 |
36 | 169 |
"Calibre des Pieces"
1/4 | 33 |
1/2 | 42 |
3/4 | 48 |
1 | 53 |
2 | 66 |
3 | 71 |
4 | 83 |
5 | 90 |
6 | 96 |
7 | 100 |
8 | 105 |
10 | 113 |
12 | 120,5 |
14 | 128 |
16 | 134 |
18 | 139,5 |
20 | 144 |
22 | 149 |
24 | 153 |
27 | 159,5 |
30 | 165,5 |
33 | 171 |
36 | 177 |