292 Records of Measures 



By top leaf its charge should be - ' = 46390 inc. el., therefore 



J / 3 



its computed charge = = 30100, and thickness of glass should seem 



_ 180 x 6 x x fj = 1 

 30100 



585] M. 7. Whether shock of battery is sensibly diminished by imperfect con- 

 duction of the salt water in the jars. 



An uncoated glass jar like the coated ones was filled with fresh water and 

 put into a glass jar of fresh water, a brass wire with knob being put into it, 

 and a slip of tinfoil into the outer jar, it was charged till straw electrometer 

 separated to 8 and tried by shock melter* filled [with] sea water, wires about 

 3 inc. dist. 



The water in inner jar was then changed for sat. sol. s. s. f and that in outer 

 for about equal parts of D and fresh water, and tried in the same manner. 

 The shock seemed rather greater, but was plainly less when electrometer was 

 at 7. 



When shock was taken without shock melter* it was as strong with el. 

 at 5 as with D at 8. Jar 2 being charged to 8 and its electricity communicated 

 to jar, the electrometer separated to 4^. 



586] M. 8. Feb. 28, 1775. 



Specific gravity bottle filled with salt water from torpedo trough weighed 

 8.4.18 by ingraved weights. Th. at 49. Specific gravity = 1-0254. 



Being mixed with ^-^ = -3525 its weight of rain water, specific gravity 

 bottle weighed 8.4.1, Th. at 49 \, specific gravity 1-0190. 



Excess of specific gravity above unity of stronger is to that of weaker as 

 1-335 to i. The quantity of salt in them is as 1-3524 [to i]. 



Therefore the excess of specific gravity above i differs pretty nearly, but 

 not quite, in as great a ratio as the quantity of salt in them. 



M. 9. April i. D Specific gravity bottle with water from torpedo trough 

 weighed 8 . 4 . 22 by D weights. 



April 29. Torpedo trough filled with water to within i inch of top, and 

 58 oz. salt added. 



Specific gravity bottle filled therewith, Th. at 70, weighed 8.4.12. At 54 J 

 same water weighed 8.4.16^. 



One bottle of sea water weighed 8.4.11, Th. at 67. Another bottle weighed 

 8.4.19!, Th. DO. 



Specific gravity bottle with rain water weighs 8. i . 22^. 

 [M. 10 blank.] 



* [This word occurs also in Arts. 622 and 637. See facsimile at Art. 622.] 

 t [Saturated solution of sea salt.] 



