1180 The Galvanic Battery, [No. 108. 



APPENDIX. 



Experimental Desiderata. 



As many of the details connected with the practical application 

 of the Galvanic Battery still require to be experimentally determined 

 or confirmed, I have thought it might prove useful to append to this 

 paper a few Tabular Forms, shewing to a certain extent the experiments 

 required. Having no higher object than the establishment of rules 

 for guidance in common practice, these forms have not been pre- 

 pared with a view to great minuteness of quantitative measurement, 

 but they are still, it is conceived, sufficiently extensive to admit of 

 the deduction of valuable practical inferences, and should they not 

 be considered so, they can readily be modified. 



In recording experiments, all particulars connected with the Battery 

 employed should be minutely and carefully specified, and it should 

 never be forgotten, that if these are neglected or imperfectly stated, 

 the value of the result obtained is most seriously diminished, and in 

 some cases entirely destroyed. Each series of experiments should be 

 prefaced by a detail of the dimensions of the copper and zinc elements 

 of the Battery ; of the state of the zinc rods or plates ; of the number of 

 times they may have previously been used ; of the state of their surfaces ; 

 whether amalgamated or not ; of the nature and quantities of the 

 solutions employed; of the nature and state of the partitions of the 

 connections throughout the Battery, and of such other points as the 

 experimenter may consider it useful to note. The same careful detail 

 should be entered into, relative to the conductors used. The results of 

 the experiments should, whenever it is practicable, be entered in their 

 proper columns in the forms immediately on being obtained, as it is 

 impossible to trust to memory for a series of numerical statements, 

 and a single error may cast doubt on a whole set of experiments. 



