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
LITTLE MICRO-CAR “BUDDY”
Little micro-car "Buddy" machine... for kids. It was created in a laboratory experimental simulation and design Club for young technicians Novosibirsk Akademgorodok. Despite its small...
THE “PATCHWORK” OF SUBMARINES
By the beginning of the First world war, all naval power was quite easy to divide the main with a significant naval power with diverse and numerous ships of all classes, and secondary,...
