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He seemed to pluck his results from the air with necromantic cunning, and what had taken the young man at his elbow days and nights of cruel effort to accomplish -- what had put haggard lines about his mouth and eyes -- the engineer accomplished in a few hours by means of that sliding-rule.
He unrolled the blue-prints, from a drawer he produced a sliding-rule.
Parker was cautious, brilliant, far - sighted; he reduced the battle to paper, he blue-printed it; with sliding-rule he analyzed it into inches and pounds and stresses and strains: Mellen was like a grim Hannibal, tireless, cunning, cold, and he wove steel in his fingers as a woman weaves her thread.