XXXVI 



Introduction to the Makerstoun Observations, 1844. 



sions or 4', and the periods of the cross passing the wire, are estimated to a tenth of a 

 second (See Table 12, Introd. 1843, p. xxxix.) The arc of vibration at the com- 

 mencement was measured by means of the right micrometer, it was usually taken 

 very small on account of the difference in the times of vibration with difference of 

 arc (afterwards noticed, 54), although it is now certain that large arcs of vibration 

 give a time which satisfies better the previous equation and the true coefficient of 

 the instrument. 



The following Table contains the observations for the value of T made in 1844. 



The number of vibrations observed, is given in the column after that contain- 

 ing the arc of vibration at commencement. 



Table 5. — Values of T, the Time of Vibration of the Balance Needle in a Vertical 

 Plane, with the Temperature of the Needle. 



Gbttingen 



Arc of 



No. of 



Time of 



n, Gbttingen 



Arc of 



No. of 



Time of 





Mean Time. 



Vib. 



Vib. 



Vib. 



Temp. 



Mean Time. 



Vib. 



Vib. 



Vib. 



Temp. 



Jan. 



d. h. 



22 



3-5 



40 



9-31 



38-3 



Feb. 



d. li. 



1 22 



40 



25 



9-28 



34-6 



Jan. 



2 22 



2-8 



20 



8-91 



31-4 



Feb. 



2 22 



4 



2 



20 



9-40 



35-7 



Jan. 



3 2 



4-4 



30 



9-48 



40-0 



Feb. 



5 I 



3 



1 



15 



9-22 



33-7 



Jan. 



3 4 



4-6 



15 



9-80 



43-5 



Feb. 



5 22 



3 



9 



20 



907 



31-3 



Jan. 



3 5 



5-0 



13 



9-96 



45-2 



Feb. 



6 23 



3 



2 



20 



9-22 



34-4 



Jan. 



3 22 



4-0 



30 



9-74 



41-4 



Feb. 



7 22 



3 



8 



30 



9-22 



34-4 



Jan. 



4 22 



4-2 



20 



9-67 



41-2 



Feb. 



8 22 



3 



3 



20 



914 



36-7 



Jan. 



5 22 



3-7 



20 



9-97 



46-5 



Feb. 



9 22 



3 



8 



20 



913 



34-5 



Jan. 



7 22 



3-8 



30 



9-42 



39-6 



Feb. 



11 22 



3 



6 



10 



8-87 



32-6 



Jan. 



8 22 



2-6 



15 



9-38 



39-3 



Feb. 



12 22 



4 







20 



8-99 



34-3 



Jan. 



9 23 



4-3 



20 



9-22 



37-5 



Feb. 



13 22 



3 



1 



20 



8-87 



38-6 



Jan. 



10 22 



4-0 



10 



9-52 



40-8 



Feb. 



14 22 



3 



1 



20 



911 



43-7 



Jan. 



11 22 



4-2 



30 



9-49 



43-9 



Feb. 



15 22 



3 







20 



9-20 



39-6 



Jan. 



12 22 



31 



15 



9-48 



38-4 



Feb. 



16 22 



2 



8 



20 



9-04 



42-6 



Jan. 



14 22 



3-8 



15 



9-12 



32-6 



Feb. 



18 22 



2 



9 



20 



905 



42-2 



Jan. 



15 23 



4-4 



20 



901 



34-1 



Feb. 



19 23 



4 



6 



10 



8-78 



33-3 



Jan. 



16 22 



30 



30 



8-90 



34-9 



Feb. 



20 22 



2 



9 



20 



8-76 



32-4 



Jan. 



17 22 



3-5 



15 



915 



36-9 



Feb. 



21 23 



3 



1 



20 



8-45 



27-6 



Jan. 



18 22 



3-1 



30 



9-35 



43-0 



Feb. 



22 23 



4 



2 



15 



8-62 



30-4 



Jan. 



19 23 



2-8 



30 



9-29 



36-9 



Feb. 



24 1 



3 



3 



20 



8-80 



37-1 



Jan. 



21 22 



3-6 



20 



9-33 



37-6 



Feb. 



25 22 



4 



2 



20 



8-69 



32-9 



Jan. 



22 22 



4-7 



20 



9-42 



40-4 



Feb. 



26 22 



4 







30 



8-42 



28-0 



Jan. 



23 22 



3-4 



30 



9-26 



36-4 



Feb. 



27 22 



3 



4 



20 



8-70 



34-4 



Jan. 



24 21 



2-2 



20 



9-50 



44-0 



Feb. 



28 22 



2 



6 



20 



9-15 



38-5 



Jan. 



25 22 



4-0 



30 



9-54 



41-2 



Feb. 



29 22 



3 



8 



20 



9-07 



39-3 



Jan. 

 Jan. 



26 22 

 28 13 



3-2 



30 

 20 



9-58 



45-0 



Mar. 

 Mar. 



I 22 

 3 23 



3 

 3 



2 

 2 



20 

 20 



9-33 

 917 



38-8 

 390 



Yo^i 4~ 



43-5 



Jan. 



28 22 



3-4 



35 



9-67 



40-8 



Mar. 



4 23 



4 



2 



20 



8-91 



34-0 



Jan. 



29 4 



2-8 



20 



9-69 



41-9 



Mar. 



5 22 



4 







20 



8-95 



35-2 



Jan. 



29 22 



2-9 



40 



9-84 



43-2 



Mar. 



6 23 



4 



3 



10 



904 



36-5 



Jan. 



30 22 



3-6 



30 



9-50 



36-9 



Mar. 



8 



2-9 



15 



9-08 



37-5 



Jan. d 22 h . 



The ne 



edle com 



es to resl 



very soon after 



being vil 



rated. 









Jan. 27*. 1 



Jeedle re 



moved f( 



)r the pi 



irpose of determining its 



tempers 



iture cor 



rection 



jy the 



method of defli 



actions. 



















Jan. 28 d 22 l 



. The d 



eedle see 



ms to ha 



ve a natural tendency to v 



ibrate. 









Feb. 21* 23' 



', 26* 22 



i, 27 d 22 



>■. The 



needle comes very soon to 



rest aftei 



• beiDg v 



ibrated. 





