But if the time required to find the Hour and Minute at _London_, (when at Sea or Land,) be some Weeks or Months, _after_ it was first set going; or (if cleansed) after it was last _Cleansed_; then you must add 10000.0 to what the two Indexes do shew, for each _Revolution_, that it has made, since it was so set going, or last cleansed. And if you would at any time know how many such Revolutions must be added, to what is shewn by the Horologe; you must first note the _Day_ of the Month, that you are then seeking the Hour for; as suppose _Novem. 12. 1715._ After which note the _Day_ last entred, when cleansed; as suppose _Sept. 5. 1715._ Then compute the number of Days between _Sept. 5._ and _Novem. 12._ which is 25, 31, and 12, In all 68. After which observe the _Time_ last spent in one Revolution; which you see was 5 Days, 4 Hours, and ⅛ (for which set down ⅒ for ’twill make no sensible Difference) and having thus done, say, Days Hours Hours Revo. Days As 5 4⅛ equal to 124.1 : 1 :: 68 : 13. whole Revolutions; For which, as before directed, you must add 13 times 10000.0 to the Numbers pointed to, by the two Indexes: Which if we suppose 3752.2 making in all 133752.2 will be the Number required, for the 12ᵗʰ of _November_, if the Indexes should both point as before proposed. And having now found this Number, you are prepared to find the Hour and Minute at _London_, in manner following (_viz._) suppose you are in or near 44 Degrees of Latitude, in the Autumn Season. Then seek the Latitude 44 Deg. and the Season _Autumn_, in the Book that is peculiar to your Movement, and having found both, take the Numbers Answering thereunto, which (in this Example) is 29274.2 and 240 Hours; and then say, Hours Hours As 29274.2 : 240 :: 133752.2 : 1096.84 Which being devided by 12, leaves remaining 4.84 ho. or 4 ho. 50.4 min. required, for the Hour and Minute at _London_, by which the Longitude will be found, as before directed. And seeing it was near the Winter Season: If you should add the Autumn and Winter Numbers, and Hours respectively together; and make them the two first Numbers in your Proportion; it would Æquate the Seasons more exactly: I mean, if the said Numbers had been really entred from Practice; but these are only supposed. And by this method you may Æquate the Numbers for finding the true Hour and Minute at any Season; or for any other Latitudes whatsoever. _How to find the Hour and Minute, at the place where you are, when abroad, either at Sea or Land._