Lighting a Petromax lantern
Fig. 1: Filling the container
Unscrew filling screw gauge (149), place funnel (165) into filling hole and fill with clean white kerosene (paraffin). The tank should not be filled above the level of approximately 5/8” below the opening. Replace filling screw gauge and screw on tightly turn the wheel (111) so that the pointer faces upwards.
Fig. 2: Fitting the mantle
Loosen nuts (92) remove hood (123 N) and inner casing (117 N) unscrew gas chamber (34), tie mantle (4) over the small ledge of the nozzle (3) distributing folds uniformly and make a double knot, cut off surplus strings and replace the gas chamber (34) tightly onto the inner casing. Insert inner casing. When replacing hood care has to be taken that the regulating screw will be visible.
During the initial burning period the intensity of light diminishes due to the consumption of kerosene and after about 1 ½ hour maximum air must be pumped into the tank (about 20 – 30 strokes). In order to clean nipple (50) by means of the cleaning needle (68) turn wheel (111) rapidly from left to right several times whilst the lamp is burning.
Fig. 3: Pumping air-pressure
The arrow of the wheel (111) must face upwards. The tip (223 N) of the rapid pre-heater (226) and the air release screw (13) on the screw gauge must be closed. Pump in air by pump (100) beyond the red line on gauge.
Fig. 4: Lighting
Light match and press down tip (223 N) of the rapid preheater. The match must be placed across the opening of the flame protector tube until preheater burns. Should the match not ignite, the tip must then immediately be closed so as to avoid the escape of kerosene. Repeat the operation. If the preheater does not work, clean nipple (221) with cleaning needle (180). The preheating flame should be allowed to burn for 40 – 50 seconds and whilst burning the lamp should be pumped so that the indicator goes beyond the red mark. When the preheating period has elapsed the wheel (111) should be turned slowly until the arrow faces downwards.
When using a new mantle for the first time close the tip of the rapid preheater as soon as the mantle starts to burn. Wait until the mantle has burnt off completely before proceeding with the normal preheating which should be as above. The mantle will be shaped and become brilliantly incandescent after the arrow of the wheel is turned downwards.
Fig. 5: Air regulating screw (32 N) at mixing tube (33 N)
If the intensity of the light is unsatisfactory turn regulating screw either to the right or to the left with the screw-driver on the end of the spanner (66 N) less than a quarter of a turn till maximum brightness is obtained. The screw-driver end also fits nut (112) on wheel (111).
In case of insufficient pressure:
In case of insufficient atmospherique pressure or too slow turning of the wheel when lighting, 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 to and for several times until the lantern burns normal. Otherwise the lantern should be extinguished completely and relighted immediately. Air must be pumped in.
Extinguishing the lantern: Open air release screw (13) on filling screw gauge (149). When the air has escaped turn wheel (111) so that the arrow faces upwards. If required the lantern can remain under pressure ready for use and can even be carried, provided air release screw (13) is closed and arrow on wheel (111) points upwards.
Fig. 6: Replacing the nipple (50) and/or cleaning needle (68)
Remove parts as shown in figure 2 and unscrew the nipple with spanner (66 N) while holding vaporizer ring with one hand. The key for needle (119) is used to remove the cleaning needle. When reassembling ensure that nipple is firmly tightened.
Fig. 7: Setting distance between mixing tube and nipple correctly
Be sure air release screw (13) has been opened and turn wheel arrow downwards, loosen screw (21 N) on the inner casing (117 N) so that the mixing tube can be moved. Hold the distance gauge at the fork end of the spanner (66 N) upright between nipple (50) and mixing tube (33 N), according to the calibration on the spanner (the spanner is stepped and calibrated for the various C.P`s), press mixing tube onto the distance gauge and tighten screw (21 N) until the clip (20 N) is firmly held.
General hints for maintenance of the lantern:
a) Damaged mantles must be replaced because even the smallest crack in the fabric will result in flames shooting out from it causing damage to the lantern and in particular to the glass chimney.
b) If the pump does not work efficiently unscrew cap (42), withdraw the piston, oil leather washer (46) and flatten it out slightly. If necessary, fit new oiled leather washer; when reinserting pump station tale care that leather washer faces downwards into the pump barrel.
c) The pump piston is pressed out of the pump barrel when pump valve (10) (at bottom of pump barrel (98)) becomes defective. Unscrew valve with a long screw driver, clean cheak valve cone (17) or replace it if necessary. Before unscrewing valve open air release screw (13).
d) Washer (11) filling cap (5) must always be in good condition, otherwise air will escape at this point.
e) Wash replacing or removing the lower part (153) of the vaporizer always use a new lead washer (90).
Note: If at any time a leakage of the lantern is suspected, dip the tank under normal pressure into a basin of water where bubbles will reveal the leaking point. In case of complaint please state the figure stamped in the bottom of the container of the lantern.