44'8 Dr. Kaemtz on the Augmentation of 



fluid. In this case, as I have convinced myself by experi- 

 ments made for the purpose, the diminution of intensity may 

 be neo-lected at the commencement. It is also convenient, 

 that the electromotor be always immersed in the acid in an 

 equable manner, not quicker at one time than at another. 



The diminution of intensity appears to have some relation 

 likewise to the region of the globe in which the electromotor 

 is situated. This however is merely a supposition, to which 

 I have been led by experiment ; I will not venture to main- 

 tain that it is an absolute fact. 



I have also to observe, that the wire had always an equal 

 length in my experiments, which is in all cases important, 

 since the length of the connecting wire greatly weakens the 

 electro-magnetic power. The fluid was always of an equal 

 temperature ; for the greatest difference of temperature, which 

 was observed, did not amount to more than 2" R., and I can 

 therefore take it for granted, that the temperature had been 

 equal. 



6. In this manner I found the following angles for every 

 convolution of the wire around the compass. 



This table contains, in the first vertical column, the values 

 for the angle above denoted by d, i. e. for the angle which was 

 made by the connecting wire with the magnetic meridian. The 

 negative values of it indicate that in this case an attraction 

 took place while the needle was repelled at the positive pole. 

 The succeeding columns contain the angle c round which the 

 needle was driven out of the meridian ; the angles marked 

 with an asterisk indicate, that the angle d~c, and not the angle 

 c~d, is to be taken, and the equation must be applied. 



All the angles are at least from ten observations, and I very 

 seldom took that point at which the needle remained statio- 

 nary ; but I usually observed several arcs succeeding each othei-, 



between 



