in the Service of the Navy. Phil 
= 
or their preservation. That a book should be kept properly 
prepared, in which should be contained an entry of the 
time when such time-keeper was received on board the 
vessel ; also, a comparison of the time at the ship with that 
of the time-keeper every day at noon, when that can be 
done, or as soon after as observations can be obtained to de- 
termine the time at the ship, putting down such observations 
with the particular circumstances under which they were 
made, and latitude the ship is in at the time of observation 5 
likewise the temperature of the air at that time, and at 
eight o’cloek in the morning and three o’clock in the after- 
noon. 
7. That when the ship is brought into port to be re- 
paired, or otherwise detained from actual service, the 
time-keeper should be returned to the office with the book 
containing the register of its performance, in order that the 
time-keeper maybe cleaned, repaired, or receive further 
trial of its rate. 
8. That the office for trying time-keepers be under the 
inspection and control of a commission of gentlemen, 
whose talents and situations enable them to give the best 
effect to this undertaking, such as the First Lord of the 
Admiralty, President of the Royal Society, Astronomer 
Royal, &c. 
9. That a limited number of young gentlemen, officers 
of the navy, be allowed to attend the office, to see the me- 
thod of registering and comparing the time-keepers, and to 
occasionally do it themselves in order to learn the method 
of using them. 
10. That the regular set of observations necessary to 
keep the time of the transit clock, and to ascertain the ad- 
justment of the transit instrument, be kept in a separate 
book. Some other’ considerations might be added, but 
these will necessarily arise out of the practice. 
N. B. The books containing the accounts of such watches 
as have been delivered for service, should be accurately ex~ 
amined when returned to the office, to see if the proper 
use of the time-keeper has been attended to. When the 
time-keeper is delivered to any officer, its variation from 
mean time at Greenwich should be given; or, what would 
answer still better would be a table of its variation made 
out from the previous trial, and might be given for the time 
the watch was likely to be in service before a new account 
of its rate could be obtained. 
It may not perhaps be unnecessary to obserye, that an 
accurate 
