184 Analyses of Books. [Ave. | 
Comparison of Observations. 
1813. | 1814. 1815. 
Morning .......5, 24° 09’ 18” | 24° 12’ 53” | 24° 16! O1” 
Aprils ive NOON, 5a Riotive tones 24 21 12 24 23 53 24 27 42 
Evening.:........) 24: 15 25 24 15 30 24 17 48 
AV OVIIUE! ifae ss al otal 24 12 02 24 13 12 24 16 32 
May... { Noon se 4 eS 24 20 54 24 22 13 24 27 03 
Evening..........|, 24 13 47 24 16 14 24 |9 12 
Morning ........ 24 12 55 24 13 10 24 16 11 
June...... ; NOON ee rericas 24°22" 1% 24 22 48 24 27 «18 
Evening ........ 24 16 04 24 16 29 24 19 40 
In deducing the mean of observations for June, the variation of 
the morning observation of the 18th is rejected, on account of its 
uncommon greatness, 
Between noon of the Ist June 1997 ineb 
Between noon of the Ist July aay 
Evaporation during the same period .......... 2°9 
Rain fallen 5 
ArticLe IX. 
ANALYSES oF Books. 
Philosophical Transactions of the Royal Society of London, 
for the Year 1814, Part II. ; 
This part contains the following papers. 
I. On anew Principle of constructing his Majesty’s Ships of War. 
By Robert Seppings, Esq. one of the Surveyors of his Majesty’s Navy. 
—This method, which appears to be the greatest improvement 
introduced into ship-building for many years, consists in substituting 
triangular or oblique beams for the parallel ribs which have hitherto 
constituted a ship’s frame. This adds prodigiously to the stiffness 
and strength. The intervals between these beams are filled by 
solid pieces of wood driven in and calked and pitched, so that the 
ship would swim even if the external coating of planks were removed. 
This method renders the internal coating of planks unnecessary, 
and this adds considerably to the size of the hold. The decks are 
not loose as was the case in the old system ; but systematically con- 
nected with the sides of the ship, so as materially to increase the 
strength of the whole. 
II. Remarks on the employment of oblique Riders, and on other 
Alterations in the Construction of Ships. Being the Substance of a 
Report presented to the Board of Admiralty, with additional De- 
monstrattons and Illustrations. By Thomas Young, M.D. For. 
Sec, R. S.—In this paper Dr. Young considers in the first place 
