102 



RECORD AND RESULTS OP 







Set 10. Deflections. July 



9, 1861. 







Z 1 suspended, Z 6 deflecting; distance 1.0 foot 



E. 



E. 



11- 01' 20" 



08' 20" 



42° 



" 



W. 



302 40 40 



41 40 



42.5 



W. 



E. 



10 45 00 



45 50 



43 



" 



W. 



302 15 30 



16 10 



48 



Mean 



Observations for Torsion. 



43.9 



2if = 68^26' 40' 

 2ii=68 29 35 

 M = 34 14 04 







Torsion circle. 





Scale. 



Differences. 













90 

 180 

 360 



90 



300.5 

 314.0 



286.5 

 301.0 



13.5 



21.5 

 14.5 



Mean (4) =13.9 = 14'.1 



Set 11. Deflections. Distance 1.3 foot. July 9, 1861. 



W. 



W. 321° 22' 40" 

 E. 351 43 00 



23' 30" 

 43 50 



48.05 

 46 



2zt = 30° 20' 20" 



E. 



W. 319 31 10 

 E. 350 50 10 



32 00 

 51 20 



44 

 47 



2m = 31 19 10 



Mean 



. 46.4 



u = 15 24 53 



Set 12. Vibrations. Temperature 39°. 



P. M. July 9, 1861. 



Z 6 suspended. 









g" 50'" 54» 



300 



10" 24" 31' 



3.3" 



■ 37'.0 





10 



52 01.5 



310 



25 41 



33 



39.5 



Observed time of 



20 



53 09 



320 



26 48.5 



33 



39.5 



300 vibrations, 2019'.08 



30 



54 16.5 



330 



27 56 



33 



39.5 



Time of one, 6.7303 



40 



55 23 



340 



29 02 



33 



39.0 





50 



56 30 



350 



30 10 



33 



40.0 





00 



10 02 06 



200 



13 17.5 



33 



39.08 





Arc: 204 and 462 at 





255 363 " 200 





280 319 " 350 vib's. 





Set 13. Vibrations. Temperature, 41°. 



P.M. July 9, 1861. 







11" 23-° 44=' 



300 



ll" 57" 23' 



33" 



39'. 





10 



24 51 



310 



58 30 



33 



39.0 





20 



25 58.5 



320 



59 38 



33 



39.5 



Observed time of 



30 



2T 06 



330 



12 00 45.5 



33 



39.5 



300 vibrations, 20 1 9'. 25 



40 



28 12,5 



340 



01 52 



33 



39.5 



Time of one, 6.7308 



50 



29 21 

 34 59 



350 

 200 



03 00 

 11 46 10 



33 



39.0 





LOO 



33 



39.25 





Arc: no and 435 at 





262 340 " 200 









288 



3 



12 " 352 V 



ib's. 















The combination of the deflection and vibration results is shown in the following- 

 table. The first three deflections having no corresponding vibrations, the value of 

 in was deduced from the remaining five results viz; 0.316 at 41°. 6 Fah., hence for 

 the temperature t of these deflections we have m = 0.316 (1 — 0.0002 {t — 41°. 6)). 

 The vibrations have been referred to the temperature of the deflections by correct- 

 ing the squares of the times by 1 — q (t' — t), the temperature of the deflections 



being t and that of the vibrations if ; they were also corrected for torsion ( 1 + — V 



The average value of P has been used. 



