THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OF SCIENCE. 



[FOURTH SERIES.] 



JANUARY 1870. 



I. On the Mechanical Properties of Ice. 

 By Henry Moseley, F.R.S. } Canon of Bristol*. 



TWith a Plate.] 



The Dilatation of Ice. 



IN the winters of 1845 and 1846 three series of experiments 

 on the dilatation of ice were made independently, by 

 MM. C. Schumacher of Copenhagen, Moritz of Dorpat, and 

 Pohrt at the Observatory of Pultowa. These experiments have 

 been described by W. Struve in the memoirs of the Academy 

 of St. Petersburg f. 



The experiments of M. Moritz differed from the others in 

 this, that he measured the dilatation in a direction perpendicular 

 to the surface of the water out of which the ice was frozen, 

 whilst the others measured it in a direction parallel to that surface. 



The results of the three series of experiments were nearly 

 identical. 



The coefficient of linear dilatation for 1° C. was, according 

 to M. C. Schumacher, between the temperatures —1° and 

 —22° R., -00006424, with a probable error of -00000019; ac- 

 cording to M. Pohrt, between -0°-9 and -21°'5 R., -00006387, 

 with a probable error of -00000046 ; according to M. Moritz, 

 between - 1°-36 and -22°-82 R., -00006469, with a probable 

 error of -00000061. The mean of these three measures is 

 •00006427, with a probable error of -00000018. 



* Communicated by the Author. 

 t Sciences Mathem. et Phys. S. 6. vol. iv. 

 Phil. Mag. S. 4. Vol. 39. No. 258. Jan. 1870. 



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