The style was a very straight stick, placed quite vertically, by means of a plummet, which the traveller brought away with him, and which is deposited at the vice-consulate at Tangier, in the hands of M. Delaporte.
[79] I am indebted for this calculation, and for the following obliging notice to Lieut. Col. Corabœuf, of the corps of royal geographical engineers.
| Zenithal distance of the superior edge of ⊙ | 22° | 22’ |
| Semi-diameter of ⊙ | 0° | 16’ |
| 22° | 38’ | |
| Southern declination of ⊙ | 13° | 38’ |
| North latitude | 9 | 0 |
[80] Two thousand, eight hundred and forty nine miles and a quarter.
[81] I say nothing of the false information, which the natives, and especially the Moors, have wilfully given to Europeans, to keep them away from the centre of Africa; some out of fanaticism, others for fear of losing the advantages of commerce.
| Zenithal distance of the superior edge of ⊙ | 2° | 26’ |
| Semidiameter of ⊙ | 0° | 16’ |
| 2 | 42 | |
| Northern declination of ⊙ | 15 | 9’ |
| North latitude | 17 | 51 |
I must not conceal the fact that M. Caillié made four similar observations in different places, which are too inconsistent with the itinerary to be made any use of.
[83] I have formerly given a rather remarkable example of an analogous application, in the height of the great pyramid of Memphis, measured by the assistance of mathematical instruments, and afterwards by the addition of the partial measures of the degrees, worked by imperfect processes. The results differ very little, but the number of the partial measures was 203.
[84] The latitude as determined by M. Walckenaer approaches very near to this result.