Montgomery Scott was an avid reader of technical publications, both in his capacity as a chief engineer, but also as an off-hours pursuit. In 2268, James Kirk requested that Scott go on shore leave while he was engrossed in such a journal. Scott ended up being confined to quarters after the leave, and was glad to get back to his reading. The particular journal diagram Scott was reading was labeled "Primary phaser L,R; star ship Mk IX/01; Constitution-class. (TOS: "The Trouble with Tribbles" )