294 Records of Measures 



M. 13. The salted ones taken out of water two or three hours weighed 



Mahogany 



Wainscot 



Beech 



Ash 



Alder 



Lime 



Deal 



3 15 14 

 3.9.0 

 4.8.0 



4 . 14 . 12 

 3 . 9 . 22 

 3 . 17 . ii 



3-1-4 



June 19'". Bits of tinfoil were fastened round the ends of these pieces of 

 wood with gum. 



26 being electrified to ij and its electricity communicated to the whole 

 battery gave a slight shock when received through the Lime, Alder, Ash and 

 Beech, but most through the Lime. 



iR + 36 through wainscot and 2R + 36 through deal gave much the same 

 shock, and 3R was just sensible through Mahogany. 



589] M. 14. Dimensions of coatings made to pieces of glass D, E, F, G; 

 A, B, C, I, K, L, M, H. [See Art. 324.] 



M. 15. Bluish-green ground glass from Nairne called R and S, 



M. 16. Logarithms for calculations of these plates. 



M. 17. Do. 



M. 18. Straight piece of elect[rifying] wire, thickness -15, length 30. 



Increase of quantity of electricity in wire of that thickness by increasing 

 its length from 33 to 53 inches = 4-53 inches, therefore increase of quantity of 

 electricity in wire = increase length x -226. 



The two trial plates of white plate glass, which contain together 66 inches of 

 computed power, or 66 x 1-6 inches of electricity, were balanced by twice the 

 sum of the double plates A and B + 48 of additional wire = 73-4 + 10-85 = 84-2 

 inc. el., therefore 10-7 inc. el. is to be allowed for the usual length of the 

 wire. 



[Rules for making trial plates.} 



M. 19. By p. 21 [Art. 459] it should seem that the difference between two 

 trial plates ought to be to their sum as L + S + 20 inc. of wire to L + S, or as 



20 x -226 . 

 3-6 -I 7 to 66, or as 32 : 330. 



{D 12-16 



E of Nairne are to be coated with circles -j 2-16 in diameter. 

 F [2-19 



The mean quantity of electricity in the trial plates should be 47-4 inc. if 

 nothing is allowed for additional wire, therefore if this is increased by ^ to 



allow for uncertainty, and the plate is used for , a trial plate, the com- 



