To find the size of pulley needed to give the main shaft a certain
number of revolutions, multiply the diameter of fly-wheel in inches by
the number of revolutions of the engine, and divide by revolutions of
main shaft.
To find the revolutions of main shaft when diameter of its pulley is
given, multiply the diameter of fly-wheel in inches by its number of
revolutions, and divide by the diameter of pulley in inches.
To find diameter of fly-wheel needed to drive a pulley at a given
number of revolutions, multiply the diameter of pulley in inches by
its number of revolutions, and divide by number of revolutions of the
engine.
To find revolutions of an engine with a given fly-wheel to drive a
pulley at a given number of revolutions, multiply the diameter of
pulley in inches by its number of revolutions, and divide by the
diameter of fly-wheel in inches.
Rule for finding the amount of heating surface in a locomotive boiler:
Find surface of flues by multiplying the diameter by 3.14 to get
circumference, and multiply this product by the length of the flue,
then multiply this result by the number of flues in the boiler, and
divide by 144 to get number of square feet of surface in the flues.
Multiply length and width of fire box for number of square inches in
crown sheet, then multiply the length and height of the fire box and
the result by two, which gives the number of square inches in the
sides; then multiply the width and height and multiply the result by
two, which gives the number of square inches in the ends, from which
subtract number of square inches in space left for door and flues—then
add all these results together and divide by 144 to get the number
of square feet in the fire box. Add same to number of square feet of
flues, and the total will be the number of square feet in the boiler.
By dividing number of square feet by rated horse-power of boiler will
give number of square feet of heating surface to each horse-power.
_=TABLES.=_
=ALLOYS.=
============================+====+=======+=====+=====+=====+=====
ALLOYS. |Tin.|Copper.|Zinc.|Anti-|Lead.|Bis-
| | | |mony.| |muth.
----------------------------+----+-------+-----+-----+-----+-----
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 | |
----------------------------+----+-------+-----+-----+-----+-----