272 Mr. J. Nixon on the Tides in the Bay of Morecambe 

 At 10 h 2 m a.m. Dip 8' 53"; Eye 70-2 feet ; refr. + O 1 



30 P.M. 



Mean 8 29 



Half variation 



Mean refraction (8~37^' or ) A^ +0 15 



At 5 h 12 m p.m. Dip 9'58' r 

 5 30 10 



5 45 9 58 



6 9 55 



Low water. 



Mean 9 58 



Mean refraction -fa +0 18| 

 Half variation ... +0 64 



Corrected dip and height of eye 10' 23" = 95 6 feet. 

 Tabulated do * 10 27 = 97*0 



Errors —0 4 —1*4 



September 15th 1829. 



At 10 h 50 m a.m. Lighthouse top 5" 49" depr. 1 , „ 



55 p.m. 5 51 — } 



6 a.m. 4 35 — 



(6 5 a.m. Black Comb 42 48 elev. ; refr. T ^.) 

 5 45 p.m. Lighthouse top 5 40 4 depr. 



Morning variation — 1' 15"; evening variation —94". 



At I0 h 43 m a.m. Dip 8' 454"; Eye 71*3 feet; refr. + 0' 12". 



U 5 8 49 — 68*7 -0 1 



H 47 8 30i — 64-9 +0 3 



20 P.M.— 8 29 — 64-0 — — +0 Of 

 48 8 23 — 64-5 +0 84 



Mean 8 Z5\ +0 *f 



Mean morning refraction (4i+37i) = 8~4o~" = T&y* 



Do. evening do. (4|+ 5 ) = ^~ a = fr 



