Emoji Information ℹ️ Posted September 19, 2023 Share Posted September 19, 2023 If you encountered a measure given in Didot points (‘dd’ for brevity) and the exact age and origin of the source was unknown, which conversion factor would you probably choose? 15 dd = 16 pt (Anglo-centric) 1 pt := 351.4 µm (JIS) ⇒ 1 dd = 374.82(6) µm 72.27 pt ≈ 1 in ⇒ 1 dd ≈ 374.890 µm 72 pt := 1 in ⇒ 1 dd = 376.(296) µm 8 dd = 3 mm ⇔ 2 dd = 3 Q ⇒ 1 dd = 375 µm (DIN nominal) 864 dd = 1 pois du roi ⇔ 72 dd = 1 pouce du roi ⇔ 1 dd = 2 tp (Truchet) 133 dd := 5 cm ⇒ 1 dd ≈ 375.93985 µm (Berthold) 41559 dd = 15625 mm ⇒ 1 dd ≈ 375.971510 µm (revolutionary France) 1 dd := 376 µm 1 dd := 376.065 µm (DIN) 11 dd = 12 fp (Fournier) ⇒ 1 dd ≈ 376.26 µm 1 dd := 0.01483 in = 376.682 µm 12 dd = 1 cc := 0.178 in ⇒ 1 dd = 376.7(6) µm Link to comment
Ralf Herrmann Posted September 19, 2023 Share Posted September 19, 2023 The context would define what probably works best. I can’t imagine a situation where there would be absolutely no context given. Link to comment
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