354 MR. A. E. TUTTON ON A COMPENSATED INTERFERENCE DILATOMETER, 



Elongation of screws, L, - L^ = //|-X = 0'0062243 raillim. 



Lt 3 Lti = / 3 '|X = 0-011717 millim. 

 = 0-00010622. < = 0-00000002791S. 

 L = 12-3678 millims. 

 a = 0-000 008 588 2. b = O'OOO 000 002 257 3. 



SERIES 2. 



Length of screws above table, L^ = 12'369 = thickness of oir-layer, (I. 

 Temperatures., t l = 12'0, t, = 70'0, t t 118'5. 



t, t l = 58-0. t 3 t l = IOG'5. 

 Pressures, b l 7(>3, b., = 762'1, 1> 3 = 76 T6 millims. 

 Number of transited bands, f, = 20'91, f 3 39'44. 

 Correction, + 2-19, + 3'5'2. 



Corrected number of bands, /,' = 23' 10, /,' = 42'96. 

 Wave-length of light employed, X = 0'00054(J. 1 X = 0'000273. 

 Elongation of screws, L<, Lt t f.!^\ = 0'00630G2. 



Lt s Lt t =f 3 '\ = 0-011728. 

 f) O'OOO LOG 37. </> = O'OOO 000 028 739. 

 L = 12-3677. 

 = O'OOO 008 GOO 6. b = O'OOO 000 002 323 7. 



SEKIES 3. 



Length of screws above table, L^ 12'369 = thickness of air-layer, d. 

 Temperatures, t, = 12'0, t, = 70'3, t 3 = 122'2. 



t z t l = 58-3. t 3 t l = 110-2. 

 Pressures, ^ = 761'0, b., = 761'2, b 3 = 761'9 millims. 

 Number of transited bands, /^ = 21'04, /, = 40'97. 

 Correction, + 218, + 3' 57. 



Corrected number of bands, / 2 ' = 23'22, // = 44'54. 

 Wave-length of light employed, X = 0'000546. |X = 0'000273. 

 Elongation of screws, ~Lt 2 Lt 1 = 0'006339. L 3 L<, = 0'012159. 

 0=0-00010618. ^ = 0-000000031011. 

 L = 12-3677. 

 a = 0-000 008 585 2. b = O'OOO 000 002 507 4. 



