16 



OBSEEVATIONS'ON 



Dip. 



^ . Epoch of 

 ° ^ commencing 

 i S vibration. 



^ a hrs. min. sec. 



Duration 

 of 500 

 vibra- 

 tions. 



SB 



Calculated 

 duration 

 at 60°. 



Square of the 

 preceding. 



Horizon- 

 tal inten- 

 sity. 



Total in- 

 tensity : 

 hor. being 

 1000. 



Total inten- 

 sity : that at 

 Cincinnati 

 = 1000. 



174. Pine Mount, N. J.— Lat. 39° 24' 57" N. Long. 75° 23' 01" W. June 20, 1846. 



71° 41' 22" 

 Var. 3 12 46 W. 



4 

 5 

 6 



12 17 16.0 P 

 12 44 04.4 

 1 16 02.0 



1152.8 

 1399.0 

 1395.8 



94.0 

 93.0 

 93.0 



1150.26 



1895.77 

 1391.75 



13230980676 931.42 



19481738929 938.49 



19369680625 932.98 



Mean 932.62 



2969.79 



996.19 



175. Port Norris, N. J.— Lat. 39° 14' 30" N. Long. 75° 04' 00" W. June 23, 1846. 



71° 38' 37" 

 Yar. 3 06 28 



4 



5 

 6 



8 26 01.2 P 



3 52 02.8 



4 18 08.6 



1158.6 

 1401.2 

 1398.4 



70.0 

 72.0 

 71.0 



1152.85 

 1400.02 

 1397.05 



13290631225 

 19600360004 

 19517487025 



Mean 



927.23 

 927.85 

 925.92 

 927.00 



2943.65 



987.45 



176. Egg Island Point Lighthouse, N. J.— Lat. 39° 10' 58" N. Long. 75° 11' 04" W. 

 June 24, 1846. 



71° 44' 31" 

 Var. 2 59 20 W. 



4 

 5 



5 17 00.0 P 

 5 40 01.2 



1155.2 

 1404.0 



76.0 

 75.0 



1154.00 13317160000 



1402.58 19670904009 



Mean 



925.89 

 924.52 

 924.95 



2952.31 



990.86 



177. Cape May Lighthouse, N. J.— Lat. 38° 55' 45" N. Long. 75° 00' 42" W. June 28, 

 1846. 



71° 25' 01" 

 Var. 3 03 23 W. 



4 

 5 

 6 



7 34 03.0 A 



8 06 03.2 

 8 48 05.2 



1148.0 

 1895.6 

 1392.4 



73.5 



77.5 

 83.0 



1147.00 

 1393.83 

 1389.60 



13156090000 986.72 



19427620689 936.09 



19309881600 935.87 



Mean 936.23 



2937.72 



985.48 



178. Town Bank.— Lat. 38° 58' 33" N. Long. 75° 00' 09" W. June 30, 1846. 



71° 28' 38" 

 Var. 8 01 low 



4 



5 43 86.0 P 



1147.2 



70.50 



1144.62 



18142788164 



930.07 



2915.00 



977.85 



Lewesto-wn Landing. 



Var. 2° 47' 44" W. No observation for dip or intensity made here. 



REMARKS. 



174. Pine Mount, N. J.— Locality : an isolated hill between 100 and 200 feet high. Geology : ter- 

 tiary. A few inches beneath the surface is a hard iron ore, but, by trial, it appears to be incapable of 

 attracting the magnet. 



175. Port Norris, N. J. — Geology : tertiary or alluvial. Non-magnetic. 



176. Egg Island Point Lighthouse, N. J.— Geology: tertiary on the sand-banks of the bay shore. 



177. Cape May Lighthouse, N. J. — Geology : tertiary on the drifting sands of the bay shore. 



178. Town Bank. — Locality: not at the survey "station," but at Price's, near half a mile to the 

 east of it. Geology : tertiary. 



Lewestown Landing. — Locality: on the sands of the usual landing, within half a mile of Lewestown. 



