94 



G. H. KNIBBS. THE THEORY OF THE 



No. 



Mean Beading. 



Angle. 







v s 



Heading. 



v> 



v i* 





o 



i 



a 



o / 



89 59 



a 





o / 



8959 



ii 





















" 







ii 







1 



89 



59 



45 



45 



-79 



6241 



45-0 



-77 



59-29 



2 



179 



59 



52 



67 



+ 141 



19881 



56-2 



+ 14-3 



20449 



3 



269 



59 



45 



53 



+o-i 



•01 



55-0 



+ 0-3 



•09 



4 



359 



59 



30 



45 



-79 



6241 



525 



-77 



59-29 



5 



89 



59 



20 



50 



-29 



841 



52-0 



-2 7 



7-29 



6 



179 



59 



12 



52 



-09 



•81 



521 



-07 



•49 



7 



269 



59 



20 



68 



+ 151 



228 01 



543 



+ 15-3 



23409 



8 



359 



59 



12 



52 



-09 



•81 



541 



-0-7 



■49 



9 



89 



59 



15 



63 



+ 10-1 



10201 



55-0 



+ 10-3 



10609 



10 



179 



58 



50 



35 



-179 



320-41 



53-0 



-17-7 



31329 



11 



269 



58 



30 



40 



-129 



166 41 



51-8 



-127 



161-29 



i 12 



359 



58 



40 



70 



+ 171 



292 41 



533 



+ 173 



29929 



13 



89 



58 



30 



50 



-2-9 



841 



531 



-2 7 



7'29 



! 14 



179 



58 



22 



53 



+o-i 



01 



63-4 



+ 03 



•09 



15 



269 



58 



25 



62 



+ 9-1 



82-81 



537 



+9-3 



8649 



16 



359 



58 



07 



42 



-10-9 



118-81 



53-0 



-10-7 



114-49 



17 



89 



58 



00 



53 



+o-i 



•01 



529 



+ 0-3 



•09 



18 



179 



57 



50 



50 



-2-9 



8-41 



52-8 



-27 



7-29 



19 



269 



57 



45 



55 



+ 2-1 



4-41 



52-9 



+23 



5-29 



19 



Sums. 



1005" 



1359 



166579 





1357 



166651 



n 



o 



86 



59 



52-9 



Mean 



2v 



2^ 2 





2v' 



2v' 2 



By (18) 



0J>6^ 

 — V10 



II. 



1 





Angle 







From 



1 



Angle. 



n 



u 



u 2 





/ 



899 58 



/ 



89 59 







* 



a 



a 



a 





OtolO 



50 



53-0 



+0-3 



•09 



1 11 



45 



525 



-02 



•04 



2 12 



48 



52-8 



+0-1 



•01 



3 13 



45 



52 5 



-0-2 



•04 



4 14 



52 



53-2 



+ 0-5 



•25 



5 15 



65 



545 



+ 1-8 



324 



6 16 



55 



535 



+0-8 



•64 



7 17 



40 



520 



-07 



•42 



8 18 



38 



518 



-0 9 



•81 



9 19 



30 



510 



-1-7 



2-89 



ri =10 



2*68 



25268 



7-2 



8-50 



1 Mean. 



468 



52-68 



2u 



2w 2 



8-50 



•675 j 

 = + 0-21".f 



+ 



0-66". By (19) -845 



7-2 



V(10x9) 



= + 0-64". 



* here represents the first reading (zero), and thus the 10th is the 

 (m+l)th as by the rule given hereafter. 



f This would be the probable error of the mean of the results of ten 

 independent and collateral series of measures giving the results in 

 Oolumn 3. 



