Appendix A. — Eelative 



Weber's 

 absolute 

 :tre 



ond 



XHF. 



Siemens 1864 

 issue. 



0-3316 

 0-3483 



0-6925 



1-000 



1-041 

 1-046 



1-059 



1088 



(1008 

 [10-62 



11-34 

 14-78 



27-85 

 62-48 



0-3187 

 0-3348 



0-6655 



0-9607 



1-000 

 1-005 



1-017 

 1-0456 



0-0968 

 10-20 

 10-90 

 14-19 

 26-75 

 60-03 



[To face page 480.] 



German 

 Miles. 



0-005307 

 0-005574 



9-01108 



001655 



001666 

 001675 



0-01695 

 001741 



1 0-1613 

 1 01700 

 ^ 0-1815 



H n. 



0-2365 

 0-4457 

 1-000 



inufacture coils with this unit, i 



Observations. 



Calculated from the B. A. unit. 



("From an old determination by 

 \ Weber. 



(No measurement made; ratio be- 

 tween Siemens (Berlin) and Ja- 

 cobi taken from " Weber's Gal- 

 vanometrie." 



Measurement taken from a deter- 

 mination in 1862 of a standard 

 sent by Prof. Thomson ; does not 

 agree with Weber's own measure- 

 ment of Siemens's units ; by We- 

 ber 1 Siemens's unit = 1 "025 X 10 7 

 metres-second. 



Measurement taken from three coils 

 issued by Messrs. Siemens. 



Measurement taken from coils exhi- 

 bited in 1862 by Messrs. Siemens, 

 Halske & Co. (well adjusted). 



Measurement taken from coils exhi- 

 bited in 1862 by Messrs. Siemens, 

 Halske & Co. (well adjusted). 



Equal to 10,000,000 -^^ ac 

 cording to experiments of Stand- 

 ard Committee. 



J From coils exhibited in 1862 (pretty 

 | well adjusted). 



J From coils exhibited in 1862 (in- 

 \ differently adjusted). 



f From coils exhibited in 1862 (badly 

 \ adjusted). 



f From a coil lent by Dr. Matthies- 

 \ sen (of German-silver wire). 



f From coils lent by Mr. Varley (well 

 \ adjusted). 



fFrom coils exhibited in 1862 by 

 \ Messrs. Siemens, Halske & Co. * 



