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Towards the end of the 19th century, many scientists and engineers used their growing knowledge of electrical theory in an attempt to devise a machine which would pinpoint metal. The use of such a device to find ore-bearing rocks would give a huge advantage to any miner who employed it. Early machines were crude, used a lot of battery power, and worked only to a very limited degree. In 1874, Parisian inventor Gustave Trouvé developed a hand-held device for locating and extracting metal objects such as bullets from human patients. Inspired by Trouvé, Alexander Graham Bell developed a similar device to attempt to locate a bullet lodged in the chest of American President James Garfield in 1881; the metal detector worked correctly but the attempt was unsuccessful because the metal coil spring bed Garfield was lying on confused the detector.
Junhong X-Ray Baggage Scanner adopts security inspection for carry-on baggage or parcels, with a heavy duty conveyor belt, the system can support an unprecedented heavy objects , thus allowing for heavier and larger objects screening. Our x-ray baggage scanner adopts advanced technology in the world. It can display horizontal and vertical images by two independent generators, and can quickly detect organic, inorganic, mixtures or light metals according to the effective atomic number of detected objects, which can identify overlapping articles and contraband easily and precisely. It provided an ideal security inspection system to inspect any size baggage in railway stations, bus stands, government institutions, mall centers, multiplex theaters, hotels etc.
X-Ray Screening Machines,X-Ray Baggage Screening Machines,X Ray Scanner Screening Machines
JUNHONG ELECTRONIC & TECHNOLOGY (DONGGUAN)CO., LTD. , http://www.chinametaldetector.com