Paper Documents, Envelopes, and Drawing Pens
Standard metric paper sizes use the square root of two and related numbers (√√√2, √√2, √2, 2, or 2√2) as factors between neighbour dimensions (Lichtenberg series, ISO 216). The √2 factor also appears between the standard pen thicknesses for technical drawings (0.13, 0.18, 0.25, 0.35, 0.50, 0.70, 1.00, 1.40, and 2.00 mm). This way, the right pen size is available to continue a drawing that has been magnified to a different standard paper size.
Read more about this topic: Preferred Number
Famous quotes containing the words paper, drawing and/or pens:
“All the reputedly powerful reactionaries are merely paper tigers. The reason is that they are divorced from the people. Look! Was not Hitler a paper tiger? Was Hitler not overthrown?... U.S. imperialism has not yet been overthrown and it has the atomic bomb. I believe it also will be overthrown. It, too, is a paper tiger.”
—Mao Zedong (1893–1976)
“For later in the vast gloom of cities, only there you learn
How the ideas were good only because they had to die,
Leaving you alone and skinless, a drawing by Vesalius.”
—John Ashbery (b. 1927)
“Let other pens dwell on guilt and misery. I quit such odious subjects as soon as I can, impatient to restore every body, not greatly in fault themselves, to tolerable comfort, and to have done with all the rest.”
—Jane Austen (1775–1817)