170 



Scientific Intelligence. 



made the following calculations with respect to Encke's comet. They show 

 the variations which have occurred in its elements ; and, what is particu- 

 larly interesting, they mark the places in which its return may be looked for 

 in the present year. 



1828. Aug. 28.159 



Sept. 7-175 



17.161 



27.183 



7.191 



17-162 



27.15 



Nov. 6.173 



16.171 



Oct, 



R. Asc. 



26° 35 



25 47 



23 30 



19 24 



12 57 



3 52 



352 33 



840 23 



329 1 



Dec. 



N. 



23° 17 



24 58 



26 29 



27 50 



28 43 

 28 36 

 26 51 

 23 13 

 18 13 



Uist. 



from 



earth. 



1.487 



1.270 



1.089 



0.920 



0.774 



0.658 



0.574 



0.521 



0.494 



Dist. 

 from 

 sun. 

 2.175 

 2.073 

 1.967 

 1.855 

 1.737 

 1.614 

 1.483 

 1.345 

 I. 



198 2 



In ten 



of 

 light. 

 0.096 

 ).143 

 0.218 

 0.344 



.532 

 0.886 

 1.380 

 2.033 



851 



Connaissance des Terns pour Van 1827, p. ,223, 224. 



3. Large Achromatic Telescope by -Lerebours. — In our last Number we 

 mentioned the large telescope made by Lerebours, and on the authority of 

 our correspondent in Paris we stated the object-glass to be twenty-four in- 

 ches in diameter. We learn, however, by a subsequent letter, that its diame- 

 ter is only twelve inches and one line, and its focal length twenty-two feet. 



METEOROLOGY. 



4. Mean Temperature of Penzance, deduced from Twenty-one Years' 

 Observation. — The following are the results of the observations made by 

 Edward C. Giddy, Esq.— 



44.6 



177 



I87 



754° 25°.l 52°.0 



Mean temperature of Penzance, - 52°. 



Do. according to Dr Brewster's formula for West of Europe, 52°2. 

 The preceding observations were made with a register thermometer. 

 Mr Giddy has published the results of twenty-one years' observation, 



