592 



PHILOSOPHICAL TRANSACTIONS. 



|"anno 1779. 



they cannot be exposed to the bare friction of a steel magnet. This experiment 

 however afforded a certain proof, that a magnetic needle, made of a thin steel 

 tube, would be susceptible of a strong polarity, so as to serve for the purpose 

 here intended. 



But as the two agate caps, if fixed in the middle of the substance of the tube, 

 would interrvipt some part of the continuation of the steel, and thus lessen the 

 magnetic power, the points of suspension would be better soldered or fixed on 

 the surface of the tube itself, and the agate caps fixed on the support beneath and 

 above the tube ; so that such a needle should be the reverse, in respect to the 

 suspension, of the common needles. Another advantage would be derived from 

 fixing the points of suspension on the needle itself, viz. that by the motion of 

 the fluid in which it swims, it would be less apt to acquire a too strong waving or 

 undulating motion. ■" ■•.,•1 • 



If it should be found difiicult to make very thin steel tubes properly har- 

 dened, a piece of steel could be scooped out so as to constitute the half of a 

 tube ; the other half could be made of another similar piece, or perhaps better 

 of thin brass, or any other metal, and they might be soldered together. It 

 would, perhaps, answer the same purpose if a steel magnet were shut up in a 

 thin tube of glass or some metal. 



XXXF. Abstract of a Register of the Barometer, Thermometer, and Rain, at 

 Lyndon, in Rutland, 1778. By Thomas Barker, Esq. p. 547. 



Barometer. I Thermometer. ; Rain. 



Jan. 



Feb 



Mar. 



Apr. 



May 



June 



July 



Morn. 



Aftem 



Morn. 



Aftem. 



Morn 



Aftern. 



Mom. 



Aftern. 



Mom. 



Aftern. 



Morn. 



Aftern. 



Morn. 



Aftern. 

 . Morn. 

 A"S- Aftem. 



Highest. 



Lowest. 



Sept. 

 Oct 

 Nov. 

 Dec. 



Morn. 



Aftem. 



Mom. 



Aftern. 



Morn. 



Aftern. 



Morn. 



jAftern 



Whole year. 



Mean. 



In the House. 

 Hig. Low Mean 



29.40 



-13 1 



45 

 51 



5U 



56' 



58 



61 



62 



66 



68 



70J 



73i 



67 i 



70 



62 



64 



55 



57 



52 



53 



31 



5I3 



32 



32| 



34. 



34 



35j 



37^ 



411 



43 



48.1 



49 



53 



5.i 



59 



61 



56 



56 



48 



50 



44 



45 



42 



43 



40 



41 



37 



38 



38 



39 



i\h 



43 



47 J 



49 



54 



55i 



60 



6U 



641 



66h 



63' 



65 



56 



57 



48 



■i9i 

 46^ 



47 

 44 

 45 



Abroad. 

 Hig- Low Mean 



504 



41 



44,1 



45" 



51 



52 



59 



51 



65 J 



5<)| 



70 



651 



80 J 



66' 



85 



6:i 



16 



55i 



66 



52 



61 



53 



:,6 



5lh 



52^ 



21 37 



24 33 



32 381 



24j' 36 



36 

 30 

 40 

 45 

 52 

 43 

 57 



44 



41 



51 



50 



61 



55^ 



69 



5U 59h 

 62I 72I 

 ' 56 



69 



46 



58h 



39I 



50 



42 

 57 



32h 

 Uh 

 26" 

 3SA 



30 t 40j 



38J' 46* 



28 I 40 



33 I 44 



48i 



1.980 

 0.949 

 1.196 

 1.(137 

 1.322 

 2.714 

 4.103 

 0.391 

 1.660 

 4.238 

 3.845 

 2.835 



26.270 



