Young Engineer's Guide

by J. V. Rohan

TABLES.

ALLOYS.

ALLOYS.	Tin.	Copper.	Zinc.	Antimony.	Lead.	Bismuth.
Brass, engine bearings	13	112	¼
Tough Brass, engine work	15	100	15
Tough, for heavy bearings	25	160	5
Yellow Brass, for turning		2	1
Flanges to stand brazing		32	1		1
Bell Metal	5	16
Babbitt’s Metal	10	1		1
Brass Locomotive Bearings	7	64	1
Brass, for straps and glands	16	130	1
Muntz’s Sheathing		6	4
Metal, to expand in cooling				2	9	1
Pewter	100			17
Spelter		1	1
Statuary Bronze	2	90	5		2
Type Metal, from				1	3
Type Metal, to				1	7
SOLDERS.
For Lead	1				1½
For Tin	1				2
For Pewter	2				1
For Brazing (hardest)		3	1
For Brazing (hard)		1	1
For Brazing (soft)	1	4	3
For Brazing (soft)or	2			1

CIRCUMFERENCE AND AREAS
OF CIRCLES.

Diameter.	Circumfrence.	Area.
¹/₃₂	.0981	.00076
¹/₁₆	.1963	.00306
⅛	.3926	.01227
³/₁₆	.5890	.02761
¼	.7854	.04908
⁵/₁₆	.9817	.07669
⅜	1.178	.1104
⁷/₁₆	1.374	.1503
½	1.570	.1963
⁹/₁₆	1.767	.2485
⅝	1.963	.3067
¹¹/₁₆	2.159	.3712
¾	2.356	.4417
¹³/₁₆	2.552	.5184
⅞	2.748	.6013
¹⁵/₁₆	2.945	.6902
1	3.141	.7854
	3.534	.9940
¼	3.927	1.227
	4.319	1.484
½	4.712	1.767
	5.105	2.073
¾	5.497	2.405
	5.890	2.761
2	6.283	3.141
	6.675	3.546
¼	7.068	3.976
	7.461	4.430
½	7.854	4.908
	8.246	5.411
¾	8.639	5.939
	9.032	7.491
3	9.424	7.068
¼	10.21	8.295
½	10.99	9.621
¾	11.78	11.044
4	12.56	12.566
¼	13.35	14.186
½	14.13	14.904
¾	14.92	17.720
5	15.90	19.635
¼	17.49	21.647
½	17.27	23.758
¾	18.06	25.967
6	18.84	28.274
¼	19.63	30.679
½	20.42	33.183
¾	21.20	35.784
7	21.99	38.484
¼	22.77	41.282
½	23.56	44.178
¾	24.34	47.173
8	25.13	50.265
¼	25.91	53.456
½	26.70	56.745
¾	27.48	60.132
9	28.27	63.617
¼	29.05	67.200
½	29.84	70.882
¾	30.63	74.662
10	31.41	78.539
¼	32.20	82.516
½	32.98	86.590
¾	33.77	90.762
11	34.55	95.033
¼	35.34	99.402
½	36.12	103.86
¾	36.91	108.43
12	37.69	113.09
¼	38.48	117.85
½	39.27	122.71
¾	40.05	127.67
13	40.84	132.73
¼	41.62	137.88
½	42.41	143.13
¾	43.19	148.48
14	43.98	153.93
¼	44.76	159.48
½	45.55	165.13
¾	46.33	170.87
15	47.12	176.78
¼	47.90	182.65
½	48.69	188.69
¾	49.48	194.82
16	50.26	201.06
¼	51.05	207.39
½	51.83	213.82
¾	52.62	220.35
17	53.40	226.98
¼	54.19	233.70
½	54.97	240.52
¾	55.76	247.45
18	56.54	254.46
¼	57.33	261.58
½	58.11	268.80
¾	58.90	276.11
19	59.69	283.52
¼	60.47	291.03
½	61.26	298.64
¾	62.04	306.35
20	62.83	314.16
½	64.40	330.06
21	65.97	346.36
½	67.54	363.05
22	69.11	380.13
½	70.68	397.60
23	72.25	415.47
½	73.82	433.73
24	75.39	452.39
½	76.96	471.43
25	78.54	490.87
½	80.10	510.70
26	81.68	530.93
½	83.25	551.54
27	84.82	572.55
½	86.39	593.95
28	87.96	615.75
½	89.53	637.94
29	91.10	660.52
½	92.67	683.49
30	94.24	706.86
½	95.81	730.61
31	97.38	754.76
½	98.96	779.31
32	100.5	804.24
½	102.1	829.57
33	103.6	855.30
½	105.2	881.41
34	106.8	907.92
½	108.3	934.82
35	109.9	962.11
½	111.5	989.80
36	113.0	1017.8
½	114.6	1046.3
37	116.2	1075.2
½	117.8	1104.4
38	119.3	1134.1
½	120.9	1164.1
39	122.5	1194.5
½	124.0	1225.4
40	125.6	1256.6
½	127.2	1288.2
41	128.8	1320.2
½	130.3	1352.5
42	131.9	1385.4
½	133.5	1418.6
43	135.0	1452.2
½	136.7	1486.1
44	138.2	1520.5
½	139.8	1555.2
45	141.3	1590.4
½	142.9	1625.9
46	144.5	1661.9
½	146.0	1698.2
47	147.6	1734.9
½	149.2	1772.0
48	150.7	1809.5
½	152.3	1847.4
49	153.9	1885.7
½	155.5	1924.4
50	157.0	1963.5
½	158.6	2002.9
51	160.2	2042.8
½	161.7	2083.0
52	163.3	2123.7
½	164.9	2164.7
53	166.5	2206.1
½	168.0	2248.0
54	169.6	2290.2
½	171.2	2332.8
55	172.7	2375.8
½	174.3	2419.2
56	175.9	2463.0
½	177.5	2507.1
57	179.0	2551.7
½	180.6	2566.7
58	182.2	2642.0
½	183.7	2687.8
59	185.3	2733.9
½	186.9	2780.5
60	188.4	2827.4
½	190.0	2874.7

EFFECTIVE PRESSURE OF STEAM ON PISTON.

With different rates of expansion,
boiler pressure being assumed as 100 lbs. per square inch.

Steam cut off at	¾	of stroke	= 90	lbs.	effective pressure.
“““	⅔	““	= 80	“	““
“““	½	““	= 69	“	““
“““	⅓	““	= 50	“	““
“““	¼	““	= 40	“	““