dst journey 
554 
2nd journey 
3rd journey 
— Im — Jm = Jm 
Febr. 14 37535 Febr. 24 35:44 Mrch 11 34s75 
eld 5 25 35:65 5143352 
… 16 36.60 » 20 34:49 » 14 34.55 
Mean 37217 5 Atessa 5 1D 
Mean 34:99 „ 16 32.66 
5 A7 eae 
Mean 38563 
Mean of the 3 journeys + 2m 35526. 
Journeys to Jidda (Me—J—WMe). Treated in exactly the same way 
they gave the following results. 
1st journey 2d journey 
—- Jm + 2m 
Febr. 18 36829 March 2 32812 
St DO 35.53 ee pes) De 
‚Sb 4 edn 
on 22 5.38 8 34.90 
Mean 35:89 Mean 33557 
Mean of the 2 journeys + 2” 34°73. 
The combinations Jidda—Mecca—Jidda have also been calculated 
by means of linear formulae, i.e. the corrections of the chronometer 
determined at Jidda and at Mecca have been represented resp. by 
formulae a + b(t—t,) and a’ + b(t—t,), from which the unknown 
quantities were solved after the method of least squares. The difference 
a’—a gives us the difference of longitude, or when a provisory value 
for this difference had been applied, the correction needed by that 
value. Of the 3 group of observations at Jidda March 2 and 3 
have only been used for the 2"¢ journey to Mecca, March 7 and 8 
only for the 34, 
So we found: 
4st journey + 2™ 35862 (+ 1817) 
2nd ef 30-02) EEG) 
3rd Ee Sk VEE REN 
Mean + 2m 3472 
The values in brackets are the mean residual errors in the 
observed chronometer-corrections, when they are represented by the 
calculated formulae. 
2. Results from the whole of the material. 
We have represented the observations by formulae of the second 
