The Mechanical Pencil

I am not completely sure that that is the proper name for it. If it is not the people at ARM in Cambridge are evil or illiterate. What I hope it means is a pencil that never goes dull because it is loaded with thin graphite leads that you can replace with new ones when they run out. I just recently came to value this type of pencil because I was forced to use one of the old kind, i.e. the ones you have to sharpen every 5 minutes or so. Another good thing about it compared to the old ones is that it stays the same length during its entire lifetime. A regular pencil goes shorter with every sharpening which makes it increasingly difficult to hold and write with. A reusable pen that never goes dull is a simple, but oh so useful invention.