The problem of leakage, due to variations in pressure or temperature, has always been historically connected with every fountain pen. This occurs in areas of hight altitude or during air travel or when there are abrupt changes from low to high temperatures. These variations cause the air to expand in the reservoir and this, in turn, causes the ink to spill out from the nib. The grater the changes in pressure, the greater the leakage and, at the same time, the greater the quantity of air in the filler, the greater the amount of ink leaking from the nib. In the more than one hundred-year history of the fountain pen engineers have partially resolved the problem by applying a series of combs on the feed. These combs, seen on every fountain pen, trap small quantities of ink from entering cap of the pen. However there are serious limitation in this system. In fact, the efficiency of the combs is limited only to pens with very small reservoirs, i.e. a cartridge (a capacity of about 0,8 cc.). The problem is that if we consider that ink reservoirs have an average capacity of 1cc., the user is allowed very limited writing autonomy. The Visconti Patent allows the pen to be refilled with whatever quantity of ink is desired, the volume depending solely on the size of the pen and the plunger, avoiding leakage of any kind. The barrel is divided into two sections, one smaller and one larger, which are separated by a cut-off valve. This allows a very small amount of ink to be used from reservoir and uses the larger reservoir as a back-up. When the ink in the smaller reservoir runs out, the valve can be moved back few millimeters using the blind cap and thereby transferring the ink from the larger reservoir to the smaller. When it is full, visible from the ink window, the blind cap can be screwed back in place and valve, pressing against the small reservoir, seals it off.
- From the back end of the barrel, unscrew the blind cap I
- Pull the plunger all the way out stopping when you meet resistance (Fig. 1)
- Dip the section into the ink until the section is covered
- Depress the plunger downward with one single stroke
- Count to five, allowing the filling of the pen, then remove the pen from the ink
- Screw the blind cap on (Fig. 3)
- Now the pen is ready to use. You can see the ink through the ink window C (Fig. 3)
- When your pen runs out of ink (Fig 4 - ink window C empty) is time to refill
- Unscrew the blind cap (Fig. 2) holding the nip upward
- Now reverse the nib point downward allowing the ink to slow from the reservoir G into reservoir D (Fig. 2)
- Screw blind cap on (Fig. 3)
- it is not necessary to wipe nib again.
Never fill reservoir D (ink window) before this is completely empty;
If you need to mail your pen or you want to put it into your briefcase, you can remove ink from reservoir D by unscrewing blind cap and allow ink to go back into reservoir G holding the nib upwards. Now in the same position screw on blind cap again. Ink window D is empty and you have your ink safely sealed into your pen, in reservoir G.
Once a year flush your pen with cold water and apply some silicon oil in the piston rod F (Fig. 1).