Four dots are engraved into the tab and along the
lower edge of the central hole.
Circles
Type |
Labelled |
Style |
Notes |
Equator |
|
Plain line. |
|
Tropic of Cancer |
|
Plain line. |
|
Tropic of Capricorn |
|
Plain line. |
|
Lines
Type |
Labelled |
Description |
Meridian line |
|
|
Horizon rectus |
|
|