30 ROYAL SOCIETY OF CANADA 
following microscope readings divided by the calibration constants of 
the microscopes, 1.e., the change in position of the end of the stone 
cylinder in millimetres. 
RECORD OF FIRST HEATING OF DIABASE CYLINDER. 




Reading of Reading of ’ Temp. as Total 
Microscope Microscope Bridge read from Expan- Expan- 
No.1; No. 3. Reading Curve. COS sion. 
0.631 (à ER IE IRAN RE EE ST ESC. (Wen ait celle ae 
(—.0179mm.) (ESO MM) Is ence Weta we eee .1383 mm. 
0.805 —2.297 37.9 123 1 Wl Sa cron penne .138 
( .0018) GES) AU SRE RAS PEN Set .1562 
0.787 —4.484 76.8 219,04 MUR eae .294 
( .0799) CANON WE ctw Seve eral acid cette .1395 
0.008 —5.784 104.3 2220) lesdites .434 
( .1086) 6227) CINE REA ecm a pia re .3361 
—2.949 —7.108 159.2 405.) WE US .770 
( .1268) CES D AAA), A RP A Rie ee .3712 
-3.713 —10.236 209.1 159: EI Ml ead ot eto roe 1.141 
( .3302) RES Se EE ed aa ee . 6866 
—6.492 —14.043 253.3 (ie se 1.827 
( .3289) (AE 2220 AN LR EE PR hee ERA tae .6510 
—9.285 —18.261 302.2 TL UNIS eet aries 2.478 
( .0664) CABO) 4 AE el eres Ft .2514 
—10.638 —20.084 358.5 STG ry Vines cremate 2.729 
(—.0110) (SAS) NP PERRET SEE .1658 
—10.745 —22.005 AIT SOIT) |) ISLS a ices 2.896 
(—.0634) RATS wh Ui PPS ER ET .1539 
—9.362 —25.448 470.2 10001 VER ee 3.050 
(—-.1497) PEL 05 0) OR PP EC Le —.1497 
—8 . 822 —25.448 402. QOd bb. i ismotee ta wueers 2.900 
(—.1298) (i SUS) | oo Ne ehe bi Saale Are —.1060 
—6.087 —25.168 345.8 SU SD se 2.794 
(-.1314) (0257) are len eae ~.1541 
—5.368 —25.435 295.8 jt. Bs |< cas Wile 2.640 
(—. 1072) (—. 0442) ARR I Sea eae —.1514 
—4.412 —25.954 254.5 CARE ue rer 2.488 


The next day as well as the day after that, when it had come to 
room temperature of 18.5° C, the total expansion was recorded as 
1.3785 mm. : 
