Abstract: A gas chromatography/mass spectrometry system includes two sample introduction parts, a gas chromatography part having two columns, a column oven for housing the two columns in a parallel configuration, an interface part through which an outlet end of each of the two columns is inserted, and a mass spectrometry part. The mass spectrometry part has an ionization chamber to which the outlet ends of the columns inserted through the interface part are connected, a mass separation part, an ion detector, and a vacuum chamber for housing the ionization chamber, the mass separation part, and the detector. Because the outlet ends of the parallel columns are both connected to the ionization chamber, the carrier gas flow and line velocity are the same as though there is one column, thereby avoiding line stagnation. Since analyses can be performed selectively with a single system, results having high reliability and precision can be obtained.

Abstract: A leg device includes a leg shaft with a male thread section having a contact section at a lower end thereof, and an elevating part supported on the leg shaft to be capable of rising and lowering. The elevating part includes a base section having a portion to be fixed to an object, a through hole for inserting the leg shaft, and a locking piece integrated with the base section at one end thereof. The locking piece has a female threaded section on a front surface of the other end thereof for engaging the male threaded section of the leg shaft, and an operation knob on a rear surface of the other end. The base section and locking piece are integrally formed to position the female threaded section of the locking piece inwardly beyond an outer surface of the leg shaft passing through the through hole.