The Steam Engine Explained and Illustrated (Seventh Edition) / With an Account of Its Invention and Progressive Improvement, and Its Application to Navigation and Railways; Including Also a Memoir of Watt

by Dionysius Lardner

In engines which work without expansion we have

e′ =	a	.
	1 + c

For condensing engines without expansion, we shall then have

e′ =	3875969	= 3691399;(33.)
	1·05

and for non-condensing engines,

e′ =	4347826	= 4140787.(34.)
	1·05

As the diameters of the cylinders of engines are generally expressed in inches, the corresponding areas of the pistons expressed in square feet are given in the following table, so that the values of A may be readily found:—

Diameter.	Area.	Diameter.	Area.
Inches.	Sq. Feet.	Inches.	Sq. Feet.
10	07545	48	127566
11	07660	49	137095
12	07785	50	137635
13	07922	51	147186
14	17069	52	147748
15	17227	53	157321
16	17396	54	157904
17	17576	55	167499
18	17767	56	177104
19	17969	57	177721
20	27182	58	187348
21	27405	59	187986
22	27640	60	197635
23	27885	61	207295
24	37142	62	207966
25	37409	63	217648
26	37687	64	227340
27	37976	65	237044
28	47276	66	237758
29	47587	67	247484
30	47909	68	257220
31	57241	69	257967
32	57585	70	267725
33	57940	71	277494
34	67305	72	287274
35	67681	73	297065
36	77069	74	297867
37	77467	75	307680
38	77876	76	317503
39	87296	77	327338
40	87727	78	337183
41	97168	79	347039
42	97621	80	347907
43	107085	81	357785
44	107559	82	367674
45	117045	83	377574
46	117541	84	387485
47	127048	85	397406

Diameter.	Area.	Diameter.	Area.
Inches.	Sq. Feet.	Inches.	Sq. Feet.
86	407339	124	837863
87	417283	125	857221
88	427237	126	867590
89	437202	127	877970
90	447179	128	897361
91	457166	129	907763
92	467164	130	927175
93	477173	131	937599
94	487193	132	957033
95	497224	133	967479
96	507265	134	977935
97	517318	135	997402
98	527382	136	1007880
99	537456	137	1027369
100	547542	138	1037869
101	557638	139	1057380
102	567745	140	1067901
103	577863	141	1087434
104	587992	142	1097977
105	607132	143	1117532
106	617283	144	1137097
107	627445	145	1147674
108	637617	146	1167261
109	647801	147	1177859
110	657995	148	1197468
111	677201	149	1217088
112	687417	150	1227719
113	697644	151	1247361
114	707882	152	1267013
115	727131	153	1277676
116	737391	154	1297351
117	747662	155	1317036
118	757944	156	1327732
119	777236	157	1347439
120	787540	158	1367157
121	797854	159	1377886
122	817180	160	1397626
123	827516	161	1417377

[Pg521]