The most common drawing board for engineers and also for illustrators used a parallelograms to keep the rulers parallel to itself. The detail picture shows the 'head' of the machine: The rulers could be exchanged according to the desired scale; they could also be rotated in 15 degree steps or fixed at an arbitrary angle.
For wide drawing boards (especially used in the ship industy) the parallelogram mechanism was replaced by a horizontal rail on top with a 't-square' on roller barings holding the drawing head.
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