38 ROYAL SOCIETY OF CANADA 


Results of Fourth Results of Fifth Results of Sixth 
Heating. Heating. Heating. 
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Tempera- Total Ex- Tempera- | Total Ex- | Tempera-| Total Ex- 
ture. pansion. ture. pansion. | ture. pansion. 
19°C. .952 mm. | 18°C. | 1.048mm. | 25°C. | 1.074 mm. 
188 1.063 179 1.143 122 1.099 
346.5 1.414 266 1.317 204 1.221 
504.5 2.119 346.5 | 1.519 284 1.359 
18 1.048 423.5 1.785 377 1.650 
ASS IPN MIE DUT Et 478 1.998 484 2.047 
UL SR a dolore ME SONS 25 1.074 487.5 2.129 
«duh case illus Scrcke ICE PREPARED pee a ae 18 1.095 



After the six heatings of the marble, the length obtained with the 
vernier calipers was 20.029 cms., indicating a permanent elongation of 
0.104 ems., which is in good agreement with the value given in the above 
table, or 0.1095 ems., considering the fact that the ends of the marble 
were not very nicely finished. 
The results of two sets of readings on the nickel-steel cylinder of the 
furnace are also given here, as being of interest in indicating the relative 
expansion of this alloy and the rocks examined, and especially the 
general accuracy of the work with the rocks. 
The composition of this nickel-steel was given by Dr. Adams as 
being approximately as follows: 
PORT OM EMI eR Ree bee tia brea .30 
Manpaheses. UE PARENT EU RER .74 
DICO. ere ES EPS ECTS .162 
Phosplorus:.t4 e's Case ogee NP .035 
[Ui e) She oan a RER BP cv) ae .038 
Nickel Es ARR RR ee AREA 4.740 
TON ie op eg th Ree ee 7 
The readings on the nickel-steel were taken on two marks at a dis- 
tance apart of 20.09 cms. as measured with a metre scale. The deter- 
mination was made with a cylinder of stone within the furnace and the 
thermo-junction arranged as before, and the following results were 
obtained (See also Figure VII, in which the circles represent the points 
taken during one heating, and the crosses the points during the other 
heating.) 
