The above is one of the sets of observations made by Major Robinson at St. Helen's Island, Upper Canada, in 1845. Reference was always made to the particular transit and chronometer used; stating also if the error of collimation had been determined, and the transit levelled immediately before the observation, and whether the east or west end of the axis was illuminated.

In the transit books used on this occasion, made of four or five quires of letter paper bound up in a strong cover, the right-hand page was printed in the above form, leaving the other blank for recording levels, calculating the azimuthal errors, &c., &c.

The form for registering transit observations in a permanent Observatory, is of course different from the above: that at present in use at the Royal Engineer Observatory at Chatham, taken from the “Corps Papers,” is given as an example.

4:587 4.751 4.915

29

58
59

29

0.076
0.079
0·082

59 60

0.161

30

9.830

30

60

FOR CONVERTING SPACE INTO TIME, AND VICE VERSA.

SPACE INTO TIME.

TIME INTO SPACE. To convert degrees and parts of the Equator into To convert Sidereal Time into degrees and parts

Sidereal Time; or to convert degrees and parts of the Equator; or to convert Time into degrees of Terrestrial Longitude into Time.

and parts of Terrestrial Longitude.