The Book of Dreams (Jack Vance novel) in the free inaugural issue as part of a contest, offering large cash prizes to anyone who can first identify any or all of the ten people in the photograph. An attractive red-haired young woman, Alice Wroke, seeks temporary employment processing the contest entries. Gersen, expecting an attempt at infiltration by Treesong, covertly uses a lie detector on her and confirms his suspicions. Eventually, each of the subjects is identified, except for one man who seems to have a variety of identities. When a contestant submits the correct identification for all ten, Gersen confronts Alice and places most of his
Photoionization detector Photoionization detector A photoionization detector or PID is a type of gas detector. Typical photoionization detectors measure volatile organic compounds and other gases in concentrations from sub parts per billion to 10 000 parts per million (ppm). The photoionization detector is an efficient and inexpensive detector for many gas and vapor analytes. PIDs produce instantaneous readings, operate continuously, and are commonly used as detectors for gas chromatography or as hand-held portable instruments. Hand-held, battery-operated versions are widely used in military, industrial, and confined working facilities for health and safety. Their primary use is for monitoring possible worker exposure to volatile