VOL. LXXXV.] 



PHILOSOPHICAL TKANSACTIONS. 



61 3 



XIX. Abstract of o Register of the Barometer, Thermometer, and Rain, at 

 Lyndon, in Rutland, 1794. Bij Thos. Barker, Esq. p. 410. 



Thermometer. H Rain. 



Jan. 

 Feb. 

 Mar. 

 Apr. 

 May- 

 June 

 July 

 Aug. 

 Sept. 

 Oct. 

 Nov. 

 Dec. 



Mom. 



Aftern. 



Morn. 



Aftern. 



Morn. 



Aftern. 



Mom. 



Aftern. 



Morn. 



Aftern. 



Morn. 



Aftern. 



Mom. 



Aftern. 



Morn. 



Aftern. 



Morn. 



i^ytern. 



Morn. 



Aftern. 



Mom. 



Aftern. 



Morn. 



Aftern. 



June '22 to 

 July 21 



Barometer. 



Highest. 



IqcIics. 



30.03 

 29.77 

 29.9s 

 29.96 

 30.11 

 29.88 

 29-93 



29.82 



29.89 



29.88 

 29.71 

 29.92 



29.93 



Lowest. 



Inches. 



28.06 



29.26 



Mean. 



Inthea, 

 29.50 



29.62 



In the House. 



Hig.lLow 



42 

 42^ 

 49 

 56 



491 



50 



59 



61^ 



6u 



62 



65^ 



70i 



70 



73, 



661 



6U 



601 



63 



56 



57 



-19 



51 



50 



50 



f70 

 173 



31 



32| 



41' 



41 



42 



42^ 



41 



45 



49 



51 



53 



51-J 



Mean 



36 



36 



45 



45 i 



45 1 



47 



51 



53 



53 1 



55 



60 



6U 



Abroad, 

 Hig. Low Mean 



61 i; 66 



62 



57 



59 



4^1 



50' 



44 



45 



38| 



39 



3li 



32 



68 

 61 



63^ 

 56* 

 57 1 

 51 

 53 i 

 45 

 46 

 40 

 40 § 



6U' 66 

 63|' 68 



43 



48 



51 



56 



50 



55 



55.^ 



74 



59 



71 



68 



86 



67 



64 



76h 



60 



69 



57 



62^ 



52 



55 



53 



53 



68 

 86 



23 

 27 

 36^ 



41 

 32 

 41 

 36 

 41 

 41 



49 

 4!) 

 53 



561 



6s' 



47 

 60 



36 



48 



35h 



42 



31 



36 



25J 



29 



57 



32 



37 



43 



48 



41 



49^ 



46 



58 



48 



59 



55i 



69k 



62 



76 



56 



67 i 



50 



591 



46 



53 



41j 



45J 



36 



Lyndon. 



62 



68| 77 



Inch. 



0.417 



1.396 



1.656 



1.990 



1.039 



O.7O8 



4.199 



2.8^1 



3.573 



3.535 



3.963 



1.219 



26.576 



XX. An Account of the Trigonometrical Survey carried on iyi \7Q\, 1792, 1703, 

 and 1794, by Order of his Grace the Duke of Richmond, late Master-Ge7ieral 

 of the Ordnance. By Lieut. Col. Edward fVilliams, and Capt. Wm. Mudge, 

 of the Royal Artillery ; and Mr. Isaac Dalby. Communicated by the Duke of 

 Richmond, F.R.S. p. 4 1 4. 



A general survey of the island of Great Britain, at the public expence, was, 

 as we learn from the 75th vol. of the Philos. Trans, under the contemplation of 

 Government so early as the year 1763, the execution of which was to have been 

 committed to the late Major-General Roy, whose public situation and talents well 

 qualified him for such an undertaking. Various causes procrastinated this event 

 till the year 1783, when the late M. Cassini de Thury transmitted a memoir to 

 the French ambassador at London, which paved the way to a beginning of this 

 important work. Calculated for the advancement of science, this memoir was 

 presented to the King, and readily met with the approbation of a monarch, so 



