210mm x 297mm
Sizes smaller than A4 are of little use in the drawing office. Drawing-boards are usually about 20 to 30mm larger than the paper size.
The former standard was based on the ancient book paper sizes and were as follows (although variations of up to an inch could be found):
Double elephant Antiquarian
20 x 15 inches 22 x 17 inches 24 x 19 inches 30 x 22 inches 34 x 26 inches 40 x 27 inches 52 x 31 inches
A paper known as half imperial, 22 x 16 inches, was much used in schoolwork.
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