The Indianapolis times. [volume] (Indianapolis [Ind.]) 1922-1965, 1935-09-28

- pert building models for contests
will find this simple Beam Scale an
excellent addition 70 their model
shopwork
Every Official outdoor contest has
weigh. restrictions and a scale for
weighing the various members Of the
model while under construction aids
the builder tremendously in bal
sncing his ship.
Designed by Scripps- Howard
Model Engineers this scale was
built al a cost Of less than 3 cents.
Il will weigh any plane or part from
10000 Of an ounce to five ounces.
MATERIALS
One piece Of white pine wood. TX
3xl5 inches, for mounting panel
One piece Of white pine wood.
1-l0Xl3x15 inches, for beam and
knife support
One piece Of white pine wood,
1ax7sx5s inch, for support block
One razor blade
One piece Of fine music wire. 3
inches long. for yoke and hooks Of
weight balances.
One piece Of No. II music wire for
pan hook.
One small aluminium pan
One 1sinch bolt and nut. about
l. inches long.
Three match sticks.
One piece Of sheet metal. I-32x <
Xl5s inches.
Two feet Of silk thread
Any kind Of wire for weights
MOUNTING PANEL
Cut the mounting panel according
10 the measurements. The thickness
Is optional with the builder
BEAM
Cut the beam as illustrated. &C.
ment the bolt IN the end and bind
in place with thread. Two inches
from the end. mark divisions every
inch as illustrated and divide into
tenths. Exactly one inch back from
inc start of the measurements, on
the top edge of the beam, cut q
small notch for the yoke This must
be accurate in order to insure cor
rect weights later. Cut the knife
edge support and cement. as illus
trated, to the top edge of the beam.
Break a razor blade as illustrated
and force into the knife edge sup
port, adding a drop of cement TO
hold it in position. Bend the yoke
Drill three holes III the pan. which
is Just a small toy pan made of a
light metal, and string with the
thread
SUPPORTS
Cut the support block as illus
trated Bend the support metal as
illustrated from 1-32 inch sheet
metal Be sure the two prongs are
parallel so that the beam side Will
line up parallel to the mounting
panel. The support block is cement
cd to the mounting panel and is re-
inforced with a screw through the
panel
BALANCING POINT AND
WEIGHTS
The balancing point is determined
by balancing the beam and is
marked with a match on the mount
ing panel The top edge of the
beam should be parallel with the
top edge of the panel The other
two matches shown on the mount
ing panel are placed at RAINBOW to
keep the beam from swinging while
weighing an object. The best way
to construct your weights accu-
rately is to have your druggist make
them for you. The LOO and 10
ounce WEIGHTS can be made from
wire and the :. ounce weight one
from lead
WEIGHING
Assemble the scale. Balance by
tightening or unscrewing the nut
on the beam bolt. After it is bal /
anced place the object to be weighed /
in the pan or on the hook Place /
the Ito. loo or . ounce weight
on the beam and slide along until
the scale balances. Multiply the
number of inches the weight is OIL
TO on the beam by the amount Of
the weight and you have the weight
of the object As example: If tho
object balanced with the Ito ounce
weight at five inches the correct
weight would be $40 ounce. SINH
larry, if the object balanced at eight
inches with the = ounce weight.
the correct weight would be four
ounces.