AMERICAN ENGINEER, CAR BUILDER

1,3812
C .......... . .Manville High
Pressure  2.38 17.2 1.25 37.20
E .......... ..%4agn<ias'ia  2.45 17.7 1.12 3690
.......... .. mper a s-
bestos  2.49 18.0 1.12 36.80
F .......... .. . B ........ .. 2.62 18.9 1.12 36.40
G .......... . .Asbestos Air
Cell ........ . . 2.77 20.0 1.12 36.00
H . . . . . . . . . . ..Manvi11e Infu- _
— sorial Earth. 2.80 20.2 1.50 35.85
I ........... . .Manvil1e Low
Pressure  2.87 20.7 L25 36.65
J ........... ..Manvil1e Mag-
nesia Asbes— .
os .......... .. 2.88 20.8 1.50 35.60
K . . . . . . . . . . ..Magnabestos... 2.91 21.0 1.12 35.50
L .......... . .Mo1ded S e c-
tional ...... . . 3.00 21.7 1.12 35.20
M .......... ..Marsden Infu-
sorial Earth. . 3.11 22.5 1.00 34.85
N . . . . . . . . . . ..Marsden Infu-
sorial Earth.. 3.27 23.7 1.00 34.60
0 .......... . .Asbestos Fire
Board  3.33 24.1 1.12 34.20
P .......... . .Calcite ....... . . 3.61 26.1 1.12 33.24
Bare Pipe .. 13.84 100  

By the advice of the members I have made an assumption
that the cost is not nearly proportional to the thickness. As
the thicker coverings are not now made in great quantities,
the actual cost of their manufacture is uncertain.

TABLE V.
VARIATIONS IN THICKNESS, ETC.
Saying

n
Saving dollars.

in B. per Ap-
T. U. per 100 sq. ——-———Net saving. proxi-
sq. ft. per ft. per 1 2 5 10 mate
Specimen. minute. year. year. years. years. years. cost.
Magnesia:
1%—inch thick ..... .. 11.62 $37.75 $7.75 $45.50 $159 $347 $30
Magnesia, 1%-inch
thick and 1 inch of
hair felt .......... .. 12.38 40.22 5.22 45.44 166 367 35
Magnesia, 1%-inch
thick and 2 inches
of hair t ...... .. 12.77 41.50 1.50 43.00 167 375 40
Nonpareil cork
1 inch ............. .. 11.64 37.80 12.80 50.60 164 353 25
2 inches ........... .. 12.84 41.75 7.75 48.50 174 383 35
3 inches .......... .. 12.94 42.05 7.95 34.10 160 370 50
Fire board:
1 inch ............. .. 10.54 34.20 9.20 43.40 146 317 25
2 inches .......... .. .48 37.25 2.25 39.50 151 337 35
3 inches .......... .. 11.70 38.00 12.00 26.00 140 330 50
4 inches .......... .. 11.83 38.40 26.60 11.80 127 ‘ 319 65

Inspection of Table V. shows the saving due to the

CONVENIENT PN EUMATIC APPLIANCES-——CI-IICAGO
PNE UMATIC TOOL COMPANY.

 

In our July issue we gave an outline description of the
new tools introduced by the Chicago Pneumatic Tool Com-
pany, and now present engravings of three devices which
have proved themselves to be especially valuable in ma-
chine and boiler shop equipment.

Car and Locomotive .Iacks.~—The design of these jacks is
very simple, not differing in essentials from others that have
been in use in railroad shops for some time. They are com-
pact and are well made and well finished from good material.
The cylinders and heads are of cast iron,with bolted machine
joints, andthepistonsare of castiron,with leather packing. The
piston rods are of steel, surmounted by bearing blocks that
are free to turn on the piston rods. The air pipe connection
is made through the upper head, and the pressure is con-
trolled by a cock. The capacity now ranges from 5 to 25
tons, several of the latter having already been ordered. Trun-
nions are cast on the cylinders and the jacks may be carried
about on a neat two—wheel metal truck, which will fit the
trunnions of all of the jacks. The design is arranged with a
view of producing jacks that may be easily used and con-
veniently transported, and which will not require repairs.

Bolt and Staybolt Nipper.—This appliance is so clearly
shown in the engraving as to be readily understood. It has
a short cylinder between the long arms of two levers, the
short arms of which are fitted to receive the hardened cut-
ters. The long arms are returned to their closed position
by strong coiled springs, attached to the outside of the
levers, where they may be seen and cared for. The nipper
is suspended by a bail with a number of holes by which it
may be held in any desired position. The machine is
adapted to work in restricted quarters. These machines are
well made and may be easily taken apart for overhauling.
They work rapidly and are controlled by a lever operating a

use of hair felt outside a standard Magnesia cover.
In five years 100 square feet of hair felt saves $7 more
than its cost, and in ten years it saves $20 above its cost.
Thejfurther sa viiig due to a second inch outside the lirst

 

 

Whitelaw Staybolt Nipper.

is $8 in ten years. Of course, the We11—known tendency of hair
felt to deteriorate should be considered.

In the case of Nonpareil Cork, increasing the thickness fro-m
one to two inches raises the cost from about $25 to $35 per 100
square feet, and increases the net saving in five years by $10
and by $30 in ten years. In other Words, the second inch of
material in use about pays for itself in two years, while the
first pays for itself in about one year. The third inch does
not increase the saving even in ten years. The second inch,
therefore, more than pays for interest and depreciation, while
the third fails to do this.

_In the case of the Asbestos Fire Board, a second inch in
thickness causes a saving of $20 in ten years, the third and
fourth inches showing a loss. ‘

In general it may be said, therefore, that if five years is the
length of life of a cover, one inch is the most economical
thickness, while a cover which has a life of ten years may to
advantage be made two inches thick.

Car and Locomotive Jacks.

valve at one end of the cylinder, shown in the engraving.
Two sizes are made. No. 1 will cut bolts up to 1 inch in
diameter, and No. 2 will cut bolts as large as 1% inches.
Their capacity is limited only by the ability of the operator
to move them to the work.

Pneumatic Flue Welder, Reducer and Expander.——This ma-
chine is a combination of devices perfected and improved
from the original devices known as the McIntosh flue welder
and the W1. imes flue reducer. They are combined on one
bed plate the 1: may be bolted to the top of a small post in
the shop, the only power connection being a. single piece
of rubber hose. Shafting being avoided, the machine may
be set up anywhere, and the air pipe carried to it. The
machines are very ingenious; they are well and strongly
built, and are automatic in the sense that the introduction