| The discovery, in 1891, of the variation of latitude by Seth Carlo Chandler Jr. depended in part upon Chandler's invention of the almucantar. |
| It does both principle-plane and almucantar sky-radiance scans, which are then processed through sophisticated inversion techniques. |
| It can be programmed to collect data in manual or automated sequences of measurements, which include almucantar and principal plane scenarios. |
| The pedestal of this almucantar is an ordinary cast-iron gaspipe, about 9 in. in diameter externally, and 6 ft. long, sunk 3 ft. in the ground. |
