5,000


.79




5,500


.08




5.680


1.00




500


.27




4,250


.76




600


.27





WHEELS FOB FIELD CABBIAGES AND LIICBEBS.
198



SECOND GROUP.
Tests on the resistance of wheels against movement of the rims with
reference to the naves, to show the force required to overcome dishing
and to cause additional movement of the nms. Rims loaded on out-
side face of wheels in four places, equidistant; naves supported at
their inner ends.
Also tests on the resistance of wheels against movement of the rims
with reference to the naves, to show the force required to increase dish-
ing. Rims loaded in the same manner as above, but on the inside, with
naves supported at their outer ends.
Wheel No. 9.
GOVERNMENT WHEEL.
16-spoke wheel with steel hub, for 3-inch field carriage, received
from Archibald Wheel Company, Lawrence, Mass.
Tire, i" thick by 2".97 wide; felloe, in two segments, 2'MO deep by
2".72 wide; weight, 158 pounds. Amount of dishing, ".96.
The spokes of this wheel were bent. Measured on the concave side
the deflections, measured on a chord of 18", were: ".06, ".06, ".09,
".10, ".13, ".11, ".13, ".07, ".08, ".13, ".12, ".10, ".10, ".11, ".06, ".10.
TEST ON FORCE REQUIRED TO OVERCOME THE DISHING.
Movement




Ycsr


of rim with

reference

to the nave.
RemarkK.
Pounds.
Inches.
600


0.
Initial load.
1,000


.04




1,600


.09




2,000


.14




2,600


.19




3.000


.28




3,200
8,600




Wheel creaked.
"si"'


4.000


.89




4,600


.48




5,000


.63




6,600


f .88
t 1.09


Diahing removed at about ".96 movement


After BU8tainin«r load 8 minutes.
600


.89




6,600


1.09




600


.39




1,000


.42




1,600


.48




2,000


.58




2,600


.60




3.000


.66




3.600


.72




4,000


.80




4,600


.88




6,000


.99




6,600


1.09




500


.39





Wheel removed from testing machine.
