WITHOUT THE USE OF THE SOUNDING-LINE. 
683 
reading was taken an hour after arrival, and the readings taken during the afternoon 
are noted below. 
From 
Bathometer. Barometer. 
2 turns 449-5 30-315 
Thermometer. 
° Fahr. 
40-5 
12.55 to 
449 
30-315 
40-5 
1.10 P.M. 
451-5 
30-32 
41 
From 
2 turns 449-5 
30-31 
42-8 
1.44 to 
448-8 
30-31 
42-8 
2 P.M. 
449-5 
30-31 
42-8 
From 
2 turns 449-7 
30-3 
43-4 
4.13 to 
449 
30-29 
44 
4.30 p.m. 
449-5 
30-29 * 
44 
The readings of the instrument taken 
the next morning at Westminster were- 
2 turns 440 
30-42 
43 
439-5 
30-42 
43-25 
440 
30-42 
43-2 
It will be found that, on correction being made for variation of temperature and 
atmospheric density, and taking the mean of the several readings (the first observed 
Westminster indications being taken as the standard), the above indications may he 
reduced to the following : — 
Bathometer. 
Before leaving Westminster 431 
At Brighton 452 
On return to Westminster 439 25 
Taking the mean of the Westminster readings, there would be a difference on the 
scale of 17 divisions, equivalent to a diminution in attraction of -0000046, whereas 
calculation gives a difference of -000066. 
I have not succeeded in finding a satisfactory explanation of this apparent anomaly, 
which can hardly he attributable to defects of the instrument or to errors in observa- 
tion, because on taking the instrument on board the steam-ship ‘Faraday’ from the 
Thames down the Channel, the variations observed (as recorded in the Table, page 684) 
accord very fairly with the increasing depth of water, but give no evidence of the 
great variations in total gravitation due to differences in latitude. In order to test the 
influence of latitude further, I- caused the instrument to be taken to Scarborough, 
which is 207 miles north of Westminster ; and the observations there taken confirmed 
generally those of Brighton, in showing insufficient variation, although their absolute 
value was rendered unreliable by an accidental disturbance of the instrument in transit. 
It must be borne in mind that both Brighton and Scarborough are on the sea-shore, 
5b 2 
