applicable to the Gold Bullion Assay. 



107 



FINENESS INDICATED. 



LOAD. 



i . 



la 



To 



1 



3 oa 





eg 



O E « 



to — 



SI 



B. Real Weight oi 

 § Cornet. 





Grain. 





60 



S| 



grain. 



3 -ta" 



o 



Grs- 



•9433 



•94 



+ 



•0033 = 



= -9433 



; 9-433 



+ 



•500 



J r 



•067 



= 10 



•9999 



nil. 



+ 



•0099 = 



= -9999 



I 9999 



+ 



nil. 



+ 



•001 



= 10 



•9172 



•91 



+ 



•0072 = 



= -9172 



: 9-172 



-h 



•800 



+ 



•028 



= 10 



•8426 



•84 



+ 



•0026 = 



= -8426 



8-426 



+ 



1-500 



+ 



•074 



= 10 



•8016 



•80 



+ 



•0016 = 



= -8016 



; 8-016 



+ 



1-900 



+ 



•084 



= 10 



•9652 



•96 



+ 



•0052 = 



= -9652 



9-652 



+ 



•300 



+ 



•048 



= 10 



•9789 



•97 



+ 



•0089 = 



= -9789 



| 9-789 



+ 



•200 



"T 



•011 



= 10 



The notation involved in this method is as easy as that of 

 the old practice, the index readings are also as facile. Thus, 

 suppose a cornet weighing *9958, and placing it in the pan 

 without any other weight, we now put the rider on the 

 division marked 60, this would read '9960 ; but as the beam 

 carries now a real weight of only 9*958 ■+■ '040 = 9'998, it will 

 show two divisions of the scale light on the right hand pan 

 or cornet side ; we may therefore either move the rider back 

 to the -0058, when the beam will have its full load 

 of *9958 + -0042 = 10 grains, making an equipoise, or we 

 may compute this '9960 — -0002 = -9958 ; for with any 

 given reading of the weights what falls short of an equipoise 

 is so much deficiency of the cornet below the fineness 

 indicated, and must be deducted from the reading to arrive 

 at the real weight of the cornet. Conversely with any given 

 reading of the weights, what is shown by the index to be in 

 excess of an equipoise, is so much excess weight of the 

 cornet beyond the fineness indicated by the weights, and 

 must be added to the reading of the weights for arriving at 

 the real weight of the cornet. 



The greater part of Mint gold assay work, in Victoria at 

 least, concerns gold varying in fineness between '8 and 1 -0, 

 or pure gold, for which the series of weights above recom- 

 mended is suitable. For the comparatively rare occasions 

 presenting gold of a fineness lower than -8 the ordinary 

 grain weights could be used as by the old method, but in 

 the sense of complements to the weight of the cornet ; say 

 that with the cornet in the pan we are obliged to place three 

 grains, and one grain and *4 of a grain, and the rider on the 

 •0043 to form an equipoise less two divisions of the index 



