| |||
| declinación de la aguja; variación de la aguja | |||
|
compass variation : 3 phrases in 2 subjects |
| Measuring instruments | 2 |
| Physics | 1 |
| |||
| declinación de la aguja; variación de la aguja | |||
|
compass variation : 3 phrases in 2 subjects |
| Measuring instruments | 2 |
| Physics | 1 |