From: tppm@rr.ca.com   
      
   On 9/14/2024 9:15 AM, Scott Dorsey wrote:   
   > Paul Dormer  wrote:   
   >> (Amusing fact.  The height divided by the width of a sheet of A4 is   
   >> almost exactly the square root of 2.  Turn a sheet of A4 to landscape and   
   >> cut it in half and you have two sheets of A5.  Put two sheets of A4 next   
   >> to each other and you get a sheet of A3.)   
   >   
   > It is a harmonized system, and is referenced to a specific sheet size which   
   > was manufactured by hand on a screen and then sliced down for different   
   > uses.   
   >   
   > We have a similar arrangement in the US where 11x17 sheets turn into two   
   > 8.5x11 sheets which turn into two 5.5x8.5 sheets and so forth, except that   
   > they all have names many of which today are mostly meaningless....   
   >   
   > And then we have book sizes which were all functions of the original   
   > folio size but with the coming of rotary presses are all different now...   
   > --scott   
   > --scott   
      
   On the American sizes go up two steps (17*22, and 22*34 (actually a 34   
   inch role) and you get standard drafting paper sizes (and news print)).   
      
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