Book VI, 65

Callimenes, resting from its long labour his sluggish hand that trembles with age,dedicates to Hermes his disc of lead that running correctly close to the straight ruler can deftly mark its track, the hard steel that eats the pens, the ruler itself, too, guide of the undeviating line, the rough stone on which the double-tooth of the pen is sharpened when blunted by long use, the sponge, wandering Triton’s couch in the deep, healer of the pen’s errors, and the ink-box with many cavities that holds in one all the implements of calligraphy.