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- Taking Linke's (28) figures as given in § 10, and supposing h, = o, h 2 = 15 X 10 4, we find for the charge in the unit tube between the ground and 1500 metres level, remembering that the
**centimetre**is now the unit of length, M = (I/41r) (125-25)/100. - From this we deduce for the charge p per cubic
**centimetre**(I/41r)Xio-5 (volt/cm 2), or 2.7 X 101 electrostatic units. - Taking the
**centimetre**, gramme and second as our fundamental units, the most convenient unit of force is that which, acting on a gramme for a second, produces in it a velocity of a**centimetre**per second; this is called a Dyne. - The unit of work is that which is required to overcome a resistance of a dyne over a
**centimetre**, and is called an Erg. - We see therefore that I cubic
**centimetre**of a normal sodium carbonate solution will exactly neutralize 0.049 gramme of sulphuric acid, 0.0365 gramme of hydrochloric acid (i.e.

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