Handbook of Railroad Construction; For the use of American engineers. / Containing the necessary rules, tables, and formulæ for the location, construction, equipment, and management of railroads, as built in the United States.

by George L. Vose

The whole pressure at one hundred pounds per inch on two sixteen inch pistons will be

2[16 × 16 × 0.7854 × 100] = 40212.

370. Table 5. Total pressures upon pistons from ten to twenty-four inches in diameter, and for steam pressures from fifty to one hundred and fifty pounds per square inch.

Diam. of cyl’r.	Area of one Piston.	WHOLE PISTON PRESSURE ON BOTH PISTONS, AT A PER INCH PRESSURE OF											Diam. of cyl’r.
		50	60	70	80	90	100	110	120	130	140	150
10	78.5	7950	9420	10990	12560	14130	15700	17270	18840	20410	21980	23550	10
11	95.0	9500	11400	13300	15200	17100	19000	20900	22800	24700	26600	28500	11
12	113.1	11310	13572	15834	18096	20358	22620	24882	27144	29406	31768	33930	12
13	132.7	13270	15924	18564	21232	23906	26540	29194	31848	34502	37156	39810	13
14	153.9	15390	18468	21546	24624	27702	30780	33858	36756	40014	43092	46170	14
15	176.7	17670	21204	24738	28272	31806	35340	38874	42408	55942	49476	53010	15
16	201.1	20110	24132	28154	32176	36198	40220	44242	48264	52062	56308	60330	16
17	227.0	22700	27240	31780	36320	40860	45400	49940	54480	59020	63560	68100	17
18	254.5	25450	30540	35630	40720	45810	50900	55990	61080	66170	71260	76350	18
19	283.5	28350	34020	39690	45360	51030	56700	62370	68040	73710	79380	85050	19
20	314.2	31420	37704	43988	50272	56556	62840	69124	75408	81692	87976	95260	20
21	346.4	34640	41568	48496	55424	62352	69380	76208	83136	90064	96992	103920	21
22	380.1	38010	45612	53214	60816	68418	77020	83622	91224	98826	106428	114030	22
23	415.5	41550	49860	58170	66480	74790	83100	91410	99720	108030	116340	124650	23
24	452.4	45240	54288	63336	72384	81432	90480	99528	108576	117626	126672	135720	24

FORMULA.

N = 5280
c × 4.

Where N = the number.

c = wheel circumference.

Example.

Speed twenty-five miles per hour, wheels four and a half feet, the number of cylinders per hour is