43b Sir W. Herschel’s astronomical observations 
“ 1805, 1810, large 10 feet telescope. Its diameter with 
“ 108 is 4' 59" ; with 171 and 220, it is 6' o".” 
“ 1799, 40 feet telescope. A globular cluster of stars/’* 
By the observation of the 7 feet telescope, which has a 
power of seeing stars that exceeds the power of the eye to 
see them 20.25 times, the profundity of this cluster is of the 
243rd order. 
Observations of the 3rd of the connoissance. 
“ 1813, 7 feet finder. It is at a small distance from a star 
“ of equal brightness ; the star is clear, the object is hazy, 
“ and somewhat larger than the star.” 
“ 1783, 7 feet telescope. With 460 the light is so feeble 
“ that the object can hardly be seen ; I suspect some stars in 
“it. 1813, with 80, many stars are visible in it.” 
“ 1799, 10 feet telescope, power 120; with an aperture of 
“ 4 inches it is resolvable ; with 5 easily resolvable ; with 6 
“ it is resolved ; with 7 and all open the stars may be easily 
“ perceived.” 
“ 1784, 1785, 20 feet telescope. A beautiful globular 
“ cluster of stars, about 5 or 6 minutes in diameter.” 
“ 1810, Large 10 feet telescope. With 171 the diameter 
“ is full 4' 30".” 
By the observation of the 7 feet telescope this cluster must 
be of the 243rd order. 
Observations of the 4, th of the connoissance , 
“ 1783, 10 feet telescope. All resolved into stars. I can 
“ count a great number of them, while others escape the eye 
“ by their minuteness.” 
* For the particulars of this observation see Phil. Trans, for 1814, page 274. 
