84 Lovering and Bond on Magnetic Observations at Cambridge. 
TABLE III.— continvep. 
June. August. September. October. 
Com- Ob- Differ- | Com- Ob- | Differ-| Com- Ob- | Differ-| Com- Ob- | Differ- 
puted. | served.| ence. | puted. | served.| ence. | puted. |/served.| ence. | puted. | served. | ence. 
I— {110.21 |109.51 
20| 109.86 |109.14 
40|109.28 |108.67 
II— _0}108.51 |108.23 
20)107.78 |107.74 
40}107.02 |107.15 
II— 9}106.27 106.75 
20)105.54 106.15 
40)104.86 |105.28 
.70|125.92 |126.22 | — .30)101.90 | 99.74 | +-2.16)101.44 101.47 | — 
.72\125.56 |125.18| 4 .38)100.62 | 99 85) + .77)101.50 |101.41 | + 09 
-61/125.06 |124.95 | + .11)100.26 |101.33 | —1.07|101.46 |101.69 | — 
-28)124.44 |124.42)+4 .02)100.80 |101.21 .41/101.31 |102.25 | — .94 
.04)123.71 |123.79 | — .08)100,29 100.16 101.06 |101.92 | — .86 
-13)122.90 123.00 | — .10) 99.71 | 99.95 .24/100.70 |101.88 | —1.18) 
.48) 122.04 |122.25 
[++ +++ 
| 
ig 
[+1 
Ea 
99.12 | 99.60 
.61|121.13 |121.05 | + .08) 98.54 | 98.47 
.42/120.22 |120.43 | | 98.03) 98.51 
.48) 100.26 |100.76 | — .50 
.07| 99.74 | 99.94) — .20 
.48| 99.16 | 98.83) +4 .33 
| 
iS 
tel 
IV— 0/104.34 '104.28| + .06|119.34 |119.90 | — .56, 97.60) 98.17] — .57| 98.56 | 98.13) 4 .43 
20103.69 {103.69)  .00/118.51|118 68|— .17| 97.31| 97.81 |— .50| 97.93 | 96.85 | 411.08 
40|103.19 |103.07 | 4. .121117.75|117.75| 00, 97.19) 96.94]-++ .25] 97.31 | 97.08 /+4+ .23 
V— _ 0{102.75 102.66] 4+ .09|117.09 |117.20 | — .11| 97.20| 96.52|4 .68] 96.72| 96.04 + .68 
20|102.35 |102.25| + .10|116.53|116.45 | 4 .08 97.41) 97.81|— .40) 96.17| 95.93 + .24 
40}102.00 |101.87| + .13]116.09 |116.03 4+ .06) 97.67 | 97.95 | — .28| 95.70 | 95.594 .11 
VI—_ 0/101.60 |101.64| — .04/115.78|115.85 | — .07| 98.28] 98.06|-4+ .22| 95.30 | 95.38 — .08 
20/101.43 |101.35 | — .08/115.59 1115.87 | — .28) 98.90 99.18] — .28) 94.99 | 95.54, — .55 
40|101.21 |101.40 | — .19]115.52|115.34 | 4.18) 99.60 100.17 | — .57) 94.79 | 95.58 | — .79 
VII— 0/101 04 100.98) + .06/115.55/115.18! 4 ,37/100.31 | 100.63|— .32 94.68 | 95.22) — .54 
20 /100.93 100.87 | + .06/115.68 |115.37 | 4 .31)101.03 100.00 | 41.03) 94.68 | 95 57) — .89 
40|100.89 |100.89|  .00/115.88 |115.69 | + .19 101.69 |100.92| 4 .77| 94.74 | 95.53) — .79 
VIII— 0/190.93 101.20 | — .27|116.14 |116.18 | — .04 102.28 102.89] — .61] 94.96 | 95.15 |— .19 
20|101.05 {101.24 | — .19/116.44 |116.26|-4+ .18 102 78 102.26|4 .52) 95.23 | 94.38 + .85 
40|101.26 |101.34 | — .08/116.76 116.35 | + 41 103.18 102.08] 41.10, 95.57 | 9484 ++ .73 
IX— 0/101.51 [101.28] + .23/117.09 |116.84| + .25 103.48 102.43] +-1.05| 95.97 | 94.96 +101 
90|101.84 |101.66 | + .18|117 41 |117.47 | — .06 103.69 101.63}+2.06 96.41 | 95.54| + .87 
40|102.19 |102.30 | — -11|117.72 [118.18 | — .46)103.84 |102.38! 41.46 96.88 | 96.14 + .74 
This Table gives four monthly mean observed places of the Magnetometer for 
every 20 minutes during the day. A parallel column gives the corresponding 
place as calculated by the empirical curve. The column of differences shows to 
what extent the empirical and observed places agree, and the signs of these differ- 
ences make it probable that they are accidental. The numbers in all these Tables 
are in minutes and decimal parts of a minute, according to the scale of the Gauss 
Magnetometer 
