MPS A I 11
Museum: Mathematisch-Physikalischer Salon, on display, Online Collection
Title: Reduction Compass
Inventory number: MPS A I 11
Date: Between 1650-1700
Material and technique: Brass, gold-plated, minted, punched, silver
Dimensions: Limb length = 33,5 cm; width = 2,0 cm; thickness = 1,8 cm
Notes: Scales for "Plumbum", "Lapis" and "Ferrum"; between the two limbs of the reduction compass is a movable track with miner's level divided in 90°. The track contains a caliber for iron, lead and stone, and two other scales with 12 equal and 12 unequal parts.
References: Dreschsler, Adolph: Katalog der Sammlung des Königl. mathematischen-physikalischen Salons zu Dresden, Dresden 1874, A 112-114 1 37-39.
Measurements of Scales (in mm)
"Ferrum"
|
10 |
101 |
|
20 |
133 |
|
30 |
155 |
|
40 |
174 |
|
50 |
188 |
|
60 |
201 |
|
70 |
215 |
|
80 |
222 |
|
90 |
230 |
|
100 |
239 |
"Lapis"
|
10 |
165 |
|
20 |
211 |
|
30 |
243 |
|
40 |
267 |
|
50 |
289 |
"Plumbum"
|
10 |
93 |
|
20 |
137 |
|
30 |
154 |
|
40 |
164 |
|
50 |
177 |
|
60 |
180 |
|
70 |
185 |
|
80 |
193 |
|
90 |
205 |
|
100 |
210 |
1 - 12 scale for Zoll
|
1 |
21 |
|
2 |
46\43,5 |
|
3 |
69 |
|
4 |
|
|
5 |
122 |
|
6 |
|
|
7 |
|
|
8 |
|
|
9 |
|
|
10 |
262 |
|
11 |
|
|
12 |
314 |