232 Mr. Bowditch’s estimate of the height &c. 
altitude of the meteor observed at Wenham, and its calculated alti- 
tude above the level of the sea (found in Table II) did not vary much 
during the time of its appearance at Wenham, it is highly probable 
that no great change was experienced from the time of the first Rut- 
land, to the first Wenham, observation. The preceding method of 
interpolation gives for the azimuth 83° 14’ 59” at Wenham, a corres- 
ponding altitude at that place of 7° 43’.* This altitude with the azi- 
muth at Rutland 168° 30’, and the corresponding altitude 18° 27’, give 
the results in Example 2, Table I, which, with an increase of 3/12” in 
the longitude, are assumed in the right hand columns of that table and 
in Table II, as the place of the meteor at the first Rutland observation. 
This addition is made to the longitude because the mean longitudes 
assumed in Table II exceed a few miles the results from the corres- 
ponding Rutland observations in Table I. 
A mistake of 1° in the observed altitudes at Wenham would pro- 
duce an error of about 23 miles in the calculated height of the me- 
teor, but the effect of this source of error cannot be great, since the 
observed altitude must have fallen between the limits 3°25’ and 
7° 10, corresponding to the heights of the barn and meteor ; as was 
observed above, 
With the altitudes, latitudes and longitudes of the meteor given 
in Table II, and the latitudes and longitudes of the places of observa- 
_ tions, were calculated the distances of the meteor inserted in Table 
II, to give at one view the results of all the observations. 
* This azimuth and altitude were found in the following manner. With the 
azimuth at Wenham estimated in Example 1, 79° 33’ 46”, was calculated, by the 
preceding formula of interpolation, the corresponding altitude at Wenham. The 
difference between this and the supposed altitude 6° 30/ was called the error of 
this supposition, The operation was repeated with another assumed altitude, a8 
8°, and the error of this supposition found. By these errors a corrected altitude 
was calculated by the Rule of False ; and by repeating the operation a few timess 
the above azimuth and altitude were obtained. 
