54 



J. P. Tennant — On Sktndard Weiglits. 



[No. 1, 



o = o 



^•0 5 = ^-0 i- 



^•005 = ^'003 



^ 4. = ^-003 



^■003 — ^'002 



^•0 2 5 = ^-0 3 



+ 0. 0. , + 0.0 0-012263 

 + 0.on.,+0.oo2— 0-021500 „ 



— 076963 „ 



— 015813 „ 



— 040638 „ 



— 093775 „ 



— 0.016100 El 



3 

 + 0.00Z 

 + 0-002 

 + 0.001 

 + 0.001 

 + 0.005 



Difference = 425 

 = 150 

 = 1625 

 „ = 1725 

 = 675 

 = 100 



Difference = 200 



From these equations I deduce 







grs. 







grs. 







0-5 



- 



240-000300 + 0-056006 





240-005927 



p. e. 



= 0000064 







192-000240 + 0-127762 



» 





192-013076 



JJ 



0000060 



0.3 



= 



144-000180 + 100631 



!? 





144 010290 



JJ 



0000047 



0., 





96-000120 + 0-081700 



)) 





96008328 



JJ 



0000048 



0.1 





48-000060 + 0-030044 



)J 





48-003078 



JJ 



0000037 



0-05 





24-000030 + 0-020606 



)J 





24-002100 



JJ 



0-000033 



0.0. 





19-200024 + 0-015988 



?5 





19-201630 



JJ 



0-000040 



Oo3 





14-400018 + 0-021269 



)) 





14-402155 



JJ 



0000033 



0.02 





9-600012 + 0-031475 



)) 





9-603180 



JJ 



0-000012 



0-01 





4-800006 + 0-025537 



>) 





4-802574 



JJ 



0000085 







"-^•0 5 





2-400003 + 0030932 



)J 





2-403111 



JJ 



0-000033 



0-0 l 





1-920002 + 0-065261 



)) 





1-926559 



JJ 



0-000040 







^•003 





1-440002 — 0-018011 



)) 





1-438193 



JJ 



0000033 



0' 2 





0-960001 + 0-033130 



JJ 





0-963329 



JJ 



0-000042 



O'o 1 





0-480001 + 0-042634 



J> 





0-484284 



JJ 



0-000035 



0-025 





12-000015 + 0030101 



)> 





12-003642 



JJ 



0-000077 



The two largest weights P^^ and V *^ of the P set are each approxi- 

 mately equal to 24 grains and their sum is of course nearly — 0.^ but 

 they are of platinum while 0.^ is of gilt bronze. Small as these are the 

 errors cannot be neglected when accuracy is required. The purpose of 

 the determination being mainly to get the values of the small weights of 

 the P set with accuracy so that they may be used to determine differences, 

 it is enough to correct the value above given of 0. ^ so that the deduced 

 value of P.2i. + Pg* same as if the comparison had been 



made in standard air. For all ordinary purposes the resulting values of 

 these weights may be used without correction. 



I have found that 48 grains of platinum would weigh less in my 

 standard air than under the circumstances of the observation by 0.000063 

 grains. Also O^ = P,,. + P,* + 0-050238 R^. 



grs. 



The value of O.^ is = 48-000060 + 0-030044 R^ 

 .-. in actual air P^^, + P *, = 48 000060 — 0-020194 R^, 

 and the correction to standard air is — 000063 

 Hence in standard air P., ,, + V = 47-999997 — 0-020194 R, 



