VARIATIONS OK SI'KCIFIO GRAVITY 



265 



been first haniiiu'ri'd (o :i somcwliat more coinjiiict foi-iii. Tlic iiia.xi- 

 miim diii'ei'ence helweeii sampler lias (liiuinished to 0. 001)7. 



Of greatest interest is Table III, which exhibits the variations 

 of density between cold drawn and annealed ])latinuMi wii'es. 



Table III. — PlathiKin irire of 1, 0.7, and 0.4 mm. iHaiiu'ter cold dnnvu (III (ind 

 V. ]'Il) (did (tftmrards Jieated to incande>ice.)ir<' {IV, VI, and VIII). 



Snch are the resnlts, Avhich confirm the earlier discovery that 

 excessive compression diminishes the specific iiraxity. T have already 

 draAvn attention to the analogy here presented to the l)ehavi()r of 

 gases under high pressures, which are less compressible than Boyle's 

 law requires. 



The exj)lanation of this curious belunior of" wires may, however, 

 depend on such factors as crystalline configuration, and, at all events, 

 requires further exi)eriments to determine. 



A second new and very important result a])pears, that strongly 

 compressed wires increase in specific gravity when heated to incan- 

 descence. This indicates that an increase of the kinetic energy of 

 the molecules suffices to restore them to their normal relations, but I 

 do not venture here upon any explanation of the phenomenon and 

 content myself with pointing out this new and independent i:)roof of 

 the variability of specihc gravity." 



1 Here follows in the original article an explanation of the author's relations 

 with Ilr. W. Sprinir in connection with the pnblication of tlioir joint researches 

 bearing on this subjcc't. 



