Multiples of δn/δt = 0.00037.

FACTOR:

1

2

3

4

.00037

.00074

.00111

.00148

5

6

7

8

.00185

.00222

.00259

.00296

9

10

11

12

.00333

.00370

.00407

.00444

13

14

15

16

.00481

.00518

.00555

.00592

17

18

19

20

.00629

.00666

.00703

.00740

21

22

23

24

.00777

.00814

.00851

.00888

The correction is subtracted from the observed value of the refractive index if the temperature of observation is below the standard temperature, when higher it is added.