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 TO their model
shOpwork
Every official outdoor contest has
weight restrictions and scale for
weighing the various members Of the
model while under construction aids
the builder tremendously in bal
ancing his ship.
Designed by Scripps- Howard
Model Engineers this scale was
built at cost Of less than cents.
Il will weigh any plane or part from
10000 of an ounce to five ounces.
MATERIALS
One piece Of white pine wood. TX
3x15 inches, for mounting panel.
One piece Of white pine wood.
1-1Oxlzx15 inches, for beam and
knife support.
One piece of white pine wood,
5zx7sx7s 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 ]. inch bolt and nut. about
II inches long.
Three match sticks.
One piece of sheet metal. 1-32x3s
xl3s inches.
Two feet of silk thread.
ANY kind Of wire for weights.
MOUNTING PANEL
Cut the mounting panel according
to the measurements. The thickness
is optional with the builder.
BEAM
Cut the beam as illustrated. Ce-
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
the start of the measurements, on
the top edge of the beam, cut
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 10
hold it in position. Bend the yoke
Drill three holes in the pan. which
IS just a small toy pan made of
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.
NCING POINT AND
WEIGHTS
The balancing point is determined
by balancing the beam and is
marked with a match on the mount
Atl5 pdIlCl. 1llt lOD tuSS VI Ilit
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 1-100 and ITO
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 10. 1-100 or y ounce weight
on the beam and slide along until
the scale balances. Multiply tho
number of inches the WEIGHT is on
to on the beam by the amount Of
the weight and you have the weigh.
of the object AS example: If the
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.