182 Dr. Maskelyne’s Obfervations on the Latitude 
the mod obliging manner, by which I am enabled to make 
further inferences concerning the difference of our meridians, 
as exhibited in the two following tables ; in reference to which 
it is to be under flood, that all the obfervations at Greenwich 
were made with a 46-inch achromatic telefcope of 3,6 inches 
aperture, except a few otherwiie noted as obferved with a 
6-feet Newtonian reflector, whofe aperture is 9,4 inches ; and 
once with a 2-feet Gregorian- refledtor, whole aperture is 4, 5 
inches; and once with an 18-inch Gregorian reflector, with 
an aperture of 4,4 inches, furnifhed with new metals of Mr. 
Edwards’s brilliant compolition, defcribed in the Appendix to 
the Nautical Almanac of the prefent year, which reflects as 
much of the incident light as an achromatic telefcope tranfmits; 
and that in making out the columns, intitled difference of me- 
ridians corrected, I have lubtradted 7" from the immerfions 
and added as much to the emerfions obferved with the 6-feet 
refledtor, and added 13" to the immerfions and fubtracfed as 
much from the emerfions obferved with the 2-feet refledtor, to 
reduce them to what the)' Ihould have been probably obferved 
at with the 46-inch achromatic telefcope, and added 5" to the 
time of the emerfion obferved on Sept. 5, 1784 at the Royal 
Obfervatory at Paris, with a 5-feet refledtor of Dollond, to 
reduce it to the 3! feet achromatic telefcope. 
r 
Difference 
