. Methods of making electrolysis surveys. . aken on a separate chart whichgreatly facilitates classification and filing of the records. Thesmoke-chart records have to be handled more carefully until afterthe record is taken and fixed, and this is in some cases a disad-vantage. Figs. 18 and 19 show, respectively, typical Esterline andBristol smoke-chart records. For indicating instruments we have found several types ofWeston instruments very satisfactory, and the Weston model 45,which can be had with double scale and in practically any range,is very much used. Keystone instruments made in tripl
. Methods of making electrolysis surveys. . aken on a separate chart whichgreatly facilitates classification and filing of the records. Thesmoke-chart records have to be handled more carefully until afterthe record is taken and fixed, and this is in some cases a disad-vantage. Figs. 18 and 19 show, respectively, typical Esterline andBristol smoke-chart records. For indicating instruments we have found several types ofWeston instruments very satisfactory, and the Weston model 45,which can be had with double scale and in practically any range,is very much used. Keystone instruments made in triple rangesare also much used and are particularly useful where a very widerange of values must be taken with the fewest possible number ofinstruments. For work requiring extremely high current sensitivity, such asfor use with nonpolarizable electrodes, or for measuring extremelysmall potential drops on heavy metallic structures, a portablegalvanometer is very desirable. An instrument which we have Bureau of Standards Technologic Paper No. 28. Fig. i8.—Section of Esterline record
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