The Tel-X-Ometer enables X-Ray investigations to be carried out in the normal school laboratory. Extensive safety precautions are built into the apparatus which conforms completely to the recommendations of the International Commission on Radiological Protection 1968.Schools should check CLEAPSS guide L93 Ionising Radiations and Radioactive Substances before purchase.The radiation level at 50mm from any part of the surface of the instrument does not exceed 0.5mR per hour. Also in accordance with the recommendations laid down a warning card is supplied with each instrument for affixing to the door of the room where the experiments are to be conducted.The apparatus is in effect an X-ray spectrometer which by means of simple adaptations will fulfil a range of requirements as follows:A broad beam of X-rays for analysis of their general propertiesSingle crystal Bragg Diffractometer having a scale accuracy of 5 minutes of arcPowder Camera for Debye/Scherrer experiments to an accuracy of 30 minutes of arcFluorescent radiation emitter for a study of the Moseley TheoryAn experimental region for the mounting of innovative studies of the teachers choice.A specially designed miniature X-ray tube is used which protrudes through the cast aluminium base of the spectrometer table and is enclosed within a thick walled lead glass dome.The apparatus is supplied with the X-ray tube installed and aligned for immediate use. Every instrument is carefully checked under working conditions before dispatch in addition to thorough testing of the X-ray tube itself.Mains power is supplied via 2m of 3-core cable and a sector enables the instrument to operate on voltages between 110 and 240 at 50 to 60Hz.A detailed instruction book is provided giving set-up details notes for twenty-five experiments (using the accessory set which is available separately - B8R06807) and teacher's notes.Technical Specifications:X-Ray Tube:Anode Voltage: 20/30kV selectable with electronic stabilisationEmitter Current: 0-80µA continuously adjustable with electronic stabilisationRadiation Dosage: <0.1mrem/h ¯¹ at 0.1m from accessible surfaceHeated Cathode: 4V 1AFocal Point: 5mm x 1mmAnode Material: CopperLeaded Glass Collimator: 5mm DiameterBeam Divergence: Better than 10°Wavelength Characteristic Radiation: Cu-Ka: 154pm Cu-Kß: 138pmDimensions: 100mm x 32mm diameterCounter Tube Goniometer:Pivot Range: 0° +10° to +130° and -10° to -130° relative to the axis of the beamAngle Coupling: Independent of sample holder alignment or in the ratio 2:1Accuracy of Bragg Angle 2?: 5 minutes of arcTimer: 0 to 60 minutes continuously adjustableMains: 115V/230V 50/60Hz via mains leadPower Consumption: 100VAOverall Dimensions:Height: 250mmDiameter: 370mmMass: 9kgSupplied complete with X-ray tube.Associated products include:B8R06807 - Basic Accessory Kit for Tel-X-OmeterB8R06805 - Geiger-Muller Tube for Tel-X-Ometer