To work poster pens are very convenient, and who was fine — what makes them miracles: you can always pick up the desired width of the line, replacing the pen on the right more. But each can hold only one “track”. But this small improvement allows us to obtain two parallel lines… in a single pass. For this, needle files propisyvaetsya portion of the working edge of the Pera: are formed like two pens in one.
Recommend to read
NOTRICED IS INTERESTING
The article "He invented nutrit" (1975, No. 5) was very interested in me. I came up with a small improvement schemes nutrida. If the plane of rotation of gears attached to a horizontal...
GARDEN HEADSETS
The design is very simple, the only condition is that the selection of quality materials and precision in layout and machining. Together the elements are joined the most common method...
