28 NOTICES OF THE MEETINGS [Feb. 28, 
“revolving light, the going out of one is comparatively immate- 
‘rial; but when one light only is used, life and death hang on its 
‘‘burning. Their intensity of thought is to keep it lighted.— In the 
“ship that is approaching are two small instruments, the quadrant 
“‘and the chronometer (the products of science) ; with these the 
“Captain will ascertain his position on the trackless ocean, He 
‘probably regards neither the construction of the lighthouse nor 
“its beautiful light. His intense interest is to see it— He says, ‘If 
“T have calculated rightly by my instruments, and made allowance 
‘for the convexity of the earth, at such an hour the light will come 
‘into view.’ Judge of his delight when it meets his eye! It is as 
“if his country watched for his return, and welcomed him home.” 
[*,* For further information the Members are referred to Mr. 
Alan Stevenson’s Rudimentary Treatise on the History, Con- 
struction, and Illumination of Lighthouses, illustrated by plates 
and diagrams, published by Mr. Weale, 59, High Holborn.] 
In the Library, were exhibited : — 
Model of Lantern of Eddystone Lighthouse [by Mr. Wilkins,] 
and Smeaton’s Account of the Eddystone Lighthouse [from the 
Royal Institution Library]. 
Fishes from the Mediterranean, preserved by Capt. Graves, R.N., 
and the Officers of the Mediterranean Survey [by Professor E. 
Forbes]. 
Photographs, principally taken in Paris, by Sir W. J. Newton [by 
Rev. J. Barlow, Sec. R. I.]. 
Models of Revolving lights for Steamers, of Tide Indicator at 
Ramsgate, and of Pratt’s Pier for Tidal Rivers [from the Society 
of Arts]. 
Model of : 46-gun Frigate with Roberts’s Circular Bow, a Danish 
Signal Lantern &c. [from the United Service Institution]. 
Mr. Faraday exhibited a Magnet, made by Hecker of Nurem- 
berg, weighing 36 grains, capable of supporting 5280 grains, 
being one hundred and forty six times its own weight. 
It will be remembered that the expression of force deduced by M. 
Hecker from the examination of a great number of magnets is 
p= 10ni. 
