The Butterfly 828 Pressure Lantern burns kerosene,
including red dye kerosene, with extreme efficiency. Under
adverse conditions they will burn home heating fuel and even diesel,
but old or ''found'' fuels should first be filtered through several
layers of coffee filters to remove any small pieces of debris.
The pressure kerosene lantern was patented in
Germany in 1910 by and used all over the world since then by military
units, in field hospitals and kitchens, anywhere bright, reliable
light was needed. The Butterfly is a close copy of the original
and widely used worldwide.
WARNING: THESE LANTERNS ARE NOT FOR EVERYONE.
If you are not mechanically inclined or want an instant light without
any work, you should use a wick-type lamp or a battery powered
lantern. If you want to light a small room, this lantern may be
too powerful for you. If you want a lantern that will burn a variety
of various oils and produces a considerable amount of light very
efficiently, AND you have some mechanical skills and are not in a
hurry, this lantern is magnificent.
Be careful when unpacking.
Turn the large red knob to 6 o'clock position - see the little
arrow! This prevents accidental damage to the needle on top of the
generator tube when unpacking - leave the knob there for now.
To install the mantle, undo two screws on the
handle. Remove the top and pull out the burner assembly. Lantern comes
with three 350-candlepower mantles from factory; we recommend 500
candlepower mantles since they burn brighter. Be careful when
stringing the mantle around the porcelain nozzle, cut the ends of
string when done. Now make sure everything is hand tight on the burner
assembly. If you have loose fittings the light is not going to be
bright and it may not burn properly! Now reassemble the lantern. You
might want to leave the top off until the mantle is lit.
Put some clean kerosene in the tank - swish it
around and dump the fuel out. You can use this fuel later if you pour
it through a clean cloth or paper first to get rid of any particles.
Also check that the rubber seal inside the "pressure gauge/fuel cap"
is ok. You have a spare in the package. [It is a good idea to clean
the tank once a year. And always use a filter funnel when
pouring fuel into the tank!]
Lighting your Lantern should be done outside.
Fill the tank 3/4 full with clean 1-K Kerosene
- you must leave some space for air! 1liter/quart bottle works well.
Close the fuel cap hand tight. Now turn the red knob to 12 o'clock
Close the pressure relief valve - the little
screw on the fuel cap.
Turn wheel so that the arrow faces upwards,
close filling cap/gauge. After about 10-15 full pumps you should
have enough air to light the lantern. The needle in the pressure gauge
usually does not move until more air is pumped in. If the pump does
not work correctly, unscrew cap of pump barrel, remove pump piston,
grease and spread leather washer. Assemble pump pistol again. Maximum
light output is attained if the pressure is pumped up to the red line
on the gauge.
Spirit cup: fill the bottle with brass nozzle
with isopropyl alcohol (Methyl Hydrate). Inside the lantern you see a
brass cup with a pipe sticking up - fill it up all the way. There is a
round hole on the bottom part of the lantern, which is bigger than
others to give you access with butterfly stamp on top of it. Light the
fuel in the cup and let it burn until it is almost gone. You can now
turn the red knob to 6 o'clock position (Open) and watch the mantle
getting brighter. If the mantle is new see note below. You can now
fully pressurize the lantern up to red mark or until it gets hard to
pump, meaning there is enough pressure.
To turn the lantern off, release the pressure
in the tank by opening the screw on the fuel cap, you will hear
hissing sound as the light dims. You will also smell kerosene. When no
pressure turn the red knob to 12 o'clock position (Closed). Leave the
pressure screw open if lantern not in use. This will prevent any
pressure build-up in the tank.
Regulating the light intensity: The light
intensity can only be regulated by rising or decreasing the pressure.
Never use hand wheel for this operation.
Insufficient pressure: In case of insufficient
atmospheric pressure or too slow turning of wheel when lit, the flame
may draw back into the mixing tube which can be observed by a loud
gurgling roaring and low intensity of light. In this case, the wheel
should be turned fast from left to right several times until the
lantern burns normally. Otherwise the lantern should be extinguished
completely and relit immediately. Air pressure in the tank must be
Cleaning the nipple: In case the light
intensity decreases despite sufficient pressure and sufficient
filling, clean the nipple by turning the hand wheel fast up and
Tight fit of nozzle and nipple: In case a flame
appears around the mantle and the mixing tube starts glowing,
extinguish the lantern immediately by turning the hand wheel upwards.
Cool down vaporizer upper part. Screw nipple tight with spanner
(included) or replace it.
Warning: Insufficient Preheating: The
recommended preheating time is 90 seconds. In case of insufficient
preheating time, the kerosene will not be gasified and this results in
flames on the upper part of the lantern. Remember to be always calm!
Turn the hand wheel upwards and open the valve of the filling
cap/gauge to decrease pressure. Wait until kerosene is burnt out
completely and start the preheating process again. Rubbing alcohol is
only 70%. Isopropyl alcohol of 91% to 99% (from a pharmacy) burns much
hotter and the preheating more reliable.
High Temperature: While putting the lantern
into operation, it develops high heat. Cool it down for at least 10
minutes before doing service or repairs.
After Operation: After operation the nipple,
nozzle, as well as all other screws should to be checked and tightened
if necessary. Cool down lantern first!
Replacing the gas mantle: Remove hood and inner
casing as described above. Clear away all sediments of the old mantle.
Fix mantle as described above.
Burning down a new gas mantle. The optimal
stability of the mantle is reached by burning it down with a lighter
or a match. If you have some black spots on the mantle, re pump the
lantern, turn the control knob from six o'clock to one or two o'clock,
and then back to six o'clock a few times. This should clear the black
off the mantle.
Replacing the leather washer: Remove pump
piston. Unscrew pump piston nut and remove old leather washer. Grease
and spread new washer for optimal function.
Replacing the nipple and needle: Loosen screws
on frame. Remove hood, inner casing and glass chimney. Set inner
casing on glass chimney to protect the porous mantle. Hold ring of
vaporizer with one hand and unscrew nipple with spanner. Remove needle
with needle key. Replace nipple and needle and assemble again.
Replacing the pump valve: Drain the container.
Remove pump piston. Unscrew valve with long screwdriver. Tip lantern
sidewards and let valve fall out. If necessary, remove valve washer
from pump base. Assemble new valve with washer and screw it tight.
DO NOT STORE FUEL IN THE LANTERN FOR LONG PERIODS
Different fuels have different break down periods.
Kerosene usually varnishes within 4 to 6 months and that would make
cleaning the tubing and jet a real chore.