874 DB. A. MATTHIES8EN ON THE EXPANSION 



Table VIT. (continued.) 

 No. 58. — No. 57 repeated, twice boiled. 



Loss of weight 

 tt. in water =W. W(l+aO- 



10-0 4-52845 4-52965 



54-2 4-47595 4-53850 



96-9 4-36970 4-54815 



V, = 4-52781(1 + 10-^ X 0-4002/+ 10"" x 0-0655^"), or if V„ = 1, then V,oo = 1'004657. 



No. 59. — Alloy of silver and copper, containing 36 •! per cent, by weight, silver deter- 

 mined by analysis, thrice boiled. 



8-5 3-19535 3-19585 



52-5 3-16165 3-20325 



95-1 3-08880 3-21080 



V,= 3-19447(1 + 10-' X 0-5065<+ 10-" x 0-327*'), or if Vo= 1, then V,«, = 1-005392. 



No. 60. — No. 59 repeated, thrice boiled. 



9*6 3-19525 3-19600 



56-4 3-15620 3-20380 



96-0 3-08725 3-21125 



V, = 3-19454(1 + 10-' X 0-4704<+ 10"" x 0-778^. or if V„= 1, then Via, = 1-005482. 



No. 61. — Alloy of silver and copper, containing 71'6 per cent, by weight, silver deter- 

 mined by analysis, gilded, thrice boiled. 



7-0 5-85330 5-85370 



53-1 5-78990 5-86770 



97-4 5-65130 5-88415 



V, = 5-85185(l + 10-'x0-4421 + 10-'"'x0-128<=), orifV„ = l, then Via, = 1-0.0570. 



No. 62. — No. 61 repeated, regilded, once boiled. 



10-1 5-85335 5-85600 



52-4 5-79205 5-86795 



98-1 5-64930 6-88505 



V, = 5-85232(1 + 10-' X 0-4406<+ 10"" X 0-132<-), or if V„ = 1, then Vioo= 1-005726. 



The alloys No. 24 to 33 belong to the first group, namely, those made of the metals 

 Avhich, when alloyed with one another, conduct electricity in the ratio of their rclatiAC 

 volumes ; from 34 to 48 to the third group, namely, those made of the metals which 

 when alloyed with one another, or with one of those belonging to the first group of 

 metals and alloys (these form the second group No. 49 to 62), conduct electricity in a 

 lower degree than that calculated from the mean of their volumes. 



In Table VIII. the mean formulae arc given for the con-ection of expansion by heat 

 for the foregoing alloys; in Table IX. those for the correction of the linear expansion 

 by heat. 



