«a METHODS OF OBSERVING THE LONGITUDE; AT SEA. 



FIRST EXAMPLE. 



Table of the go- 

 ing of three 



1 . 



Mr. Arnold's Chrono?nelers. 



Mean Dally 

 Rate of 



rotal Error 

 of Three 



chronotnelers. 











and their mean 



o1 



Dally Rate 



Dally Rate 



Daily Rate 



ThreeChro- 



Chronome- 



refult. 



f 



of No. 36. 



of No. $1. 



cf No. 59. 



nometeri. 



ters. 







Feb. 1779 



Feb. 1782 



Feb. 1783 









1 



-f 0''.79 



- 0".3 



- r'.5 



- 0".33 



- 0^33 





2 



- .15 



+ 1 -1 



1 .5 



.18 



.51 





3 



+ .15 



- .4 



-f .3 



+ .02 



.49 





4 



.00 



+ 0.5 



.7 



.40 



.09 





5 



- 1 .16 



.0 



.0 



- .39 



.48 





6 



+ 1 .34 



- .7 



- 1 .6 



.32 



.80 





7 



.81 



1 .3 



.4 



.30 



1 .10 





8 



- .26 



.0 



+ 1 -4 



-}- .38 



.72 





9 



+ .56 



. .5 



.2 



.09 



.63 





10 



.07 



.0 



.6 



.22 



.41 





11 



- .45 



+ .2 



.0 



- .08 



.49 





12 



.39 



.3 



- 1 .2 



.43 



.92 





13 



.25 



.6 



.4 



.02 



.94 





14 



.35 



.9 



+ 1 .4 



+ .65 



.29 



^ 



15 



1 .48 



- .9 



1 .2 



- .39 



.68 





16 



+ .09 



.2 



.2 



+ .03 



.65 





17 



.30 



.5 



2 .2 



.67 



-f .02 





18 



- ,58 



,7 



1 .4 



.04 



+ .06 





19 



.77 



.1 



1 .6 



6 .24 



.30 





20 



.90 



.9 



- .6 



- .80 



- .50 



- 



21 



.00 



.0 



+ .2 



4- .07 



.43 





22 



1 .55 



.0 



1 .8 



.08 



.35 





23 



.48 



+ 1 .0 



.6 



.37 



+ .02 





2+ 



.76 



.7 



1 .6 



.51 



.53 





23 



.29 



.9 



1 .2 



.60 



1 .13 





26 



.68 



1 .0 



- 1 .2 



- .29 



.34 





27 



1 .74 



1 .1 



.8 



.48 



.36 





28 



,49 



.1 



+ .5 



+ .04 



.40 



Mar. 



1 



I .86 



.4 



.7 



- .25 



.15 





'2 



- .80 



- .7 



+ 1 .8 



-I- .10 



+ .23 



SECOND 



