The electron, its isolation and measurement and the determination of some of its properties

by Robert Andrews Millikan

Mean of first 17 numbers in the last column = 61.120
Mean of last 6 numbers in the last column = 61.138

No.	p (cm. Hg)
1	75.80	22.52	.01615	4.887	61.90	61.14
2	75.00	40.85	.02933	4.981	62.82	61.26
3	73.71	44.88	.03212	4.971	62.75	61.04
4	75.20	45.92	.03288	5.001	63.00	61.24
5	73.25	46.85	0.3353	4.982	62.82	61.13
6	75.62	48.11	.03437	4.991	62.82	61.07
7	75.10	48.44	.03466	4.981	62.82	61.07
8	75.30	49.52	.03544	5.016	63.12	61.23
9	75.00	51.73	.03702	5.016	63.13	61.15
10	76.27	54.09	.03871	5.010	63.08	61.02
11	73.90	55.52	.03973	5.015	63.12	61.00
12	75.14	56.15	.04018	5.028	63.24	61.10
13	76.06	59.94	.04290	5.043	63.35	61.06
14	75.28	60.78	.04348	5.064	63.53	61.21
15	75.24	61.03	.04368	5.040	63.33	61.07
16	74.68	61.33	.04390	5.065	63.54	61.21
17	73.47	61.69	.04411	5.054	63.43	61.00
18	75.54	71.74	.05134	5.098	63.82	61.08
19	75.87	74.77	.05350	5.120	64.00	61.12
20	41.77	78.40	.05612	5.145	64.22	61.23
21	74.32	85.08	.06089	5.166	64.36	61.11
22	76.42	88.70	.06350	5.168	64.40	61.01
23	75.40	89.35	.06395	5.190	64.59	61.18
24	37.19	101.8	.07283	5.269	65.64	61.35
25	38.95	107.2	.07660	5.278	65.28	61.20
26	24.33	124.4	.08892	5.379	66.06	61.31
27	25.37	130.4	.09330	5.381	66.16	61.18
28	75.83	130.3	.09322	5.379	66.14	61.16
29	33.47	156.8	.1117	5.529	67.36	61.37

No.	Tem. °C	P.D. (Volts)	(Sec.)	cm./Sec.			cm.
30	23.19	5,090	26.830	.03801	.009111	5-12	17.77
31	23.89	5,098	38.479	.02649	.011180	3-5	14.71
32	23.06	5,070	14.060	.07246	.006762	12-17	24.29
33	23.07	4,582	18.229	.05601	.006981	10-13	21.33
34	23.06	5,061	38.010	.02682	.011205	3-8	14.72
35	23.00	4,246	9.265	.11032	.004653	27-34	29.84
36	22.91	4,236	9.879	.10340	.004863	24-28	28.74
37	23.06	4,236	12.040	.08496	.005363	18-24	26.27
38	22.94	2,556	10.657	.09581	.003109	32-43	27.49
39	23.00	5,054	19.950	.05115	.008370	8-15	20.12
40	23.09	5,058	21.130	.04830	.008865	7-9	18.38
41	23.05	5,062	24.008	.04254	.009496	6-8	18.16
42	22.94	4,238	18.347	.05564	.007110	9-17	20.60
43	23.18	3,254	13.909	.07340	.004729	16-28	23.70
44	23.04	4,231	29.114	.03503	.009273	5-9	16.16
45	22.97	3,317	29.776	.03425	.007430	5-12	15.90
46	22.81	3,401	25.909	.03937	.007311	6-19	16.90
47	22.83	2,550	12.891	.07921	.003935	18-42	23.80
48	22.80	2,559	32.326	.03150	.006286	7-14	15.01
49	23.02	3,370	14.983	.06815	.011353	8-9	22.00
50	23.45	2,535	11.659	.08757	.003783	25-30	24.88
51	23.48	2,539	10.924	.09346	.003615	27-34	25.69
52	22.98	3,351	50.400	.02021	.010775	2-6	11.83
53	23.16	2,451	33.379	.03055	.006623	5-10	14.39
54	23.46	2,533	19.227	.05347	.005314	11-17	18.87
55	22.90	2,546	24.254	.04206	.006041	9-18	16.72
56	23.21	1,700	5.058	.20256	.001861	117-136	36.53
57	23.12	2,231	15.473	.06599	.004360	18-24	20.85
58	23.03	3,388.5	24.33	.04196	.008183	6-10	16.62

No.	p (cm. Hg)
30	35.18	160.2	.1147	5.505	67.18	61.06
31	36.51	176.5	.1263	5.621	68.12	61.06
32	21.12	195.0	.1394	5.692	68.67	61.22
33	23.86	196.6	.1405	5.687	68.64	61.13
34	34.01	199.8	.1429	5.739	69.07	61.07
35	16.00	209.5	.1499	5.739	69.07	61.07
36	15.67	222.0	.1589	5.820	69.71	61.23
37	16.75	227.5	.1625	5.821	69.72	61.03
38	14.70	247.5	.1771	5.935	70.61	61.16
39	19.73	251.8	.1802	5.910	70.41	60.79
40	18.54	278.3	.1993	6.076	71.72	61.09
41	19.01	289.6	.2073	6.110	72.03	60.97
42	15.72	308.8	.2210	6.224	73.04	61.24
43	13.55	311.0	.2227	6.214	72.83	60.95
44	17.17	360.6	.2579	6.466	7477	61.00
45	17.27	364.2	.2606	6.537	75.30	61.39
46	14.68	403.3	.2886	6.719	76.71	61.30
47	9.70	432.8	.3097	6.841	77.66	61.13
48	15.35	433.8	.3104	6.866	77.85	61.28
49	10.10	448.8	.3221	6.936	78.36	61.22
50	8.60	466.7	.3340	6.978	78.67	60.85
51	8.26	470.7	.3368	7.024	79.02	61.04
52	16.95	498.5	.3568	7.210	80.40	61.36
53	12.61	551.3	.3945	7.470	82.19	61.13
54	9.03	587.8	.4112	7.661	83.73	61.18
55	10.11	591.5	.4233	7.672	83.82	61.22
56	4.46	614.2	.4396	7.777	84.57	61.11
57	7.74	619.7	.4435	7.774	84.54	60.87
58	9.070	620.2	.4439	7.810	84.63	61.14

Mean of all numbers in last column = 61.138
Mean of first 23 numbers = 61.120

They represent a thirty-fold variation in

(from .016, drop No. 1, to .444, drop No. 58), a seventeen-fold variation in the pressure

(from 4.46 cm., drop No. 56, to 76.27 cm., drop No. 10), a twelvefold variation in