We're moving offices at work which means that people are re-assessing what is and isn't going to make the move. Filing cabinets are being emptied and "treasures" are being unearthed. One of the engineers came into my office and said that he knew that I had an interest in pens an would I like to have these technical pens for my collection.
I had never seen a pen like this before; it has replaceable nib units that consist of a syringe type ink tube that has a flow control wire that runs down the centre of the tube. When the tube is pressed against the sheet of paper, the flow control wire rises in the tube, unseating the ink flow seal and allowing ink to advance down the tube and onto the paper.
The pen itself has a blind cap which exposes the piston filler knob. The pen is filled just like a standard fountain pen; simply submerge the nib into the ink bottle and draw the ink into the barrel using the piston plunger.
The pen lays down a very fine and precise line. I don't think that they will enter my regular rotation but they are certainly neat to own.