1819.] Philosophical Transactions for 1818, Part II., 301 
Yards. Error. 
At 100 yards down, 
Height by measurement ........ 826:00000 .. —_— 
By Maskelyne’s formula .......- 821°71247  .. — 4:28753 
By Hutton’s formiila. ........++ — .. — 4°60320 
At 150 yards down, 
iy by measurement ........ 7760000 «. — 
By Maskelyne’s formula........ 7723057 ww — 3°6943 
By Hutton’s formula. .........- — .. — 46444 
At 200 yards down, 
Height by measurement ........ 726°0000 «x. — 
By Maskelyne’s formula ........ 7124:°7245 4. — 1°2755 
By Hutton’s formula. .......... _ +. — 2:0920 
At 250 yards down, 
Height by measurement ...... .. 676-000 of _ 
By Maskelyne’s formula ....... . 672-252 -» — 3°7480 
By Hutton’s formula. ........ . a .. — 43152 
_ At 300 yards down, 
Height by measurement ........ 626-000 as _ 
By Maskelyne’s formula ........ 616:731 .. — 92690 
By Hutton’s formula. .........- —_ oo — 9°6532 
At 350 yards down, 
Height by measurement ........ 576-0000... — 
By Maskelyne’s formula........ 566°3645 .. — 9°6355 
By Hutton’s formula. ...,..+... — «+, 77 9:9100 
Dist. from | Height by Error of barometrical measurement, 
summit, measurement. By Maskelyne’s formula. | By Hutton’s forsaula, 
Yards. Yards, Yards. 3 Yards. 
400 526 — 12°687200 — 12-8400 
400* 526 — 8-102470 — 8-6740 
450 476 — 5°733300 — 62514 
. 500 426 — 8116700 — 86500 
550 376 — 10°157300 — 10-6186 
600 326 — 2-901242 — 33260 
650 276 — 9-108500 — 9°4460 
700 226 — 4155800 — 4-4460 
750 176 — 4-667000 — 48880 
800 126 — 8180000 — 8-2996 
850 76 — 6°631820 — 64918 
900 26 + 3°551000 + 33130 
* By another observation on a different day- 
