Part 4 (1/2)

Effect of Support and of Sc.r.a.ping.

The standard Vt3 fork held in its wooden support was compared with another fork on a resonator loaded with wax and making with standard about five beats per second. The standard was free from the cylinder. The beats were counted by coincidences with the ? second beats of a watch.

_Specimen._

Coincidences were marked--

At 32 seconds.

37 seconds.

43.5 seconds.

49 seconds.

54.5 seconds.

61.5 seconds.

61.5 - 32 = 29.5.

29.5 5 = 5.9 = time of one interval.

_Resume._

1 5.9 2 6.2 3 6.2 4 6.2 ---- Mean = 6.13 = time of one interval between coincidences.

In this time the watch makes 6.135 = 30.65 beats, and the forks make 30.65 + 1 = 31.65 beats.

Hence the number of beats per second is 31.65 6.13 = 5.163.

_Specimen._

Circ.u.mstances the same as in last case, except that standard Vt3 fork was allowed to trace its record on the lampblacked paper, as in finding its rate of vibration.

Coincidences were marked at--

59 seconds.

04 seconds.

10.5 seconds.

17 seconds.

77 - 59 = 18.

18 3 = 6.0 = time of one interval.

_Resume._

No. 1 6.0 seconds. 6.31 5 = 31.55 2 6.0 seconds. + 1.00 3 6.7 seconds. ---- 4 6.3 seconds.

5 6.5 seconds. 32.55 6 6.7 seconds. 32.55 6.31 = 5.159 7 6.0 seconds. With fork free 5.163 ---- ----- Mean = 6.31 seconds Effect of sc.r.a.pe = - .044

_Specimen._

Circ.u.mstances as in first case, except that both forks were on their resonators.