For working on the desk a ruler is still a handy tool. Most time it is combined with a 1:1 scale with tic marks at every mm. For typographic purpose also rulers with pica, points etc. are still in use.
Convenient tools on the desk are parallel moving rulers. One type has (rubber coated) rollers to guide the movement. Another type connects two parallel half-rulers with two legs forming a parallelogram with the ruler.The type with the rollers often is combined with a mechanism to slip the ruler step be step for hatsching.
A more elaborate example is pictured hereafter. This is a multipurpose tool especially for students... Even math formulas and trigonometric tables are available. With the various holes on the long edge a compass can be simulated.
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