Computations relating to the determination of the difference in longitude of Paris and Greenwich in 1888. There is an index listing the following sections:

1. 'Preliminary Work'.

2. 'Value of 1 rev. of R A Micrometer'.

3. 'Value of Level Scales'.

4. 'Inequality of Pivots, Transit B'.

5. 'Inequality of Pivots, Transit C'.

6. 'Adopted Level Errors, Transit B'.

7. 'Observations for Inclination of Wire Frame'.

8. 'Catalogues of Stars observed'.

9. 'Tables to Reduce Outside Wires to Centre Wire for Polar Stars'.

10. 'Tables for Facilitating Application of Instrumental Errors'.

11. 'Miscellaneous Computations for Preliminary Reduction'.

12. 'Rough Preliminary Reduction for Transit B' and 'Rough Preliminary Reduction for Transit C'.

13. 'Copy of all remarks in the notebook'.

14. 'Preliminary Reduction of Collimation and Azimuth'.

15. 'Preliminary Adoption of Clock Stars'.

16. 'Clock Errors'.

17. 'Comparisons of Chronographs with R.O. Chronograph'.

18. 'Comparison of Transits B and C Side by Side on 1890 April 17'.

19. 'Remarks of Astronomer Royal 1889 June'.

20. 'Discussion of Systematic Errors of Azimuth Stars'.

21. 'Discussion'.