Crystal technology grows with its crystals

been realised by Union Carbide technicians. This opens up many possibilities in the usage of lithium niobate, such as its replacement of quartz in filter units to give an increased bandwidth. Cost of the crystal depends on its cut, or whether it is bought as a raw material boule. The Roditi International Corp Ltd, Electronics Division, Carrington House, 130 Regent St, London W l R 6BR, UK

Ultrasound as aid in grinding Workpieces are positioned in relation to a rotating grindwheel by sensing vibrations of the workpiece in the ultrasound range. The vibrations are imparted to the workpiece by air turbulence due to the high-speed revolutions of the grindwheel, and their amplitude increases as the space between grindwheel and workpiece decreases, permitting detection by an accelerometer. Accuracy of positioning is claimed to be a few microns, using this, the Richmond Ultrasonic Detector.

Fig.3 Studmaster KS 705 capacitor discharge stud welder

Richmond Electronics (Markyate) Ltd, Hicks Road, Markyate, Herts, UK

The stud tip melts and welds in one millisecond, giving vertical welding rates of up to 15 per minute, with no need for flux, ferrules or inert gases. The system is designed to weld metals with no overflow, piercing, distortion or burn. Kerry Ultrasonics, Hunting Gate, Wilbury Way, Hitchin, Hertfordshire, UK.

Accessory for leak d e t e c t o r Users of the Dawe ultrasonic leak detector 8900A will be pleased to hear of the availability of a new battery-operated ultrasound transmitter (8900-25A) for use on applications where no differential pressure exists and where it was not previously possible to use ultrasonic detection techniques.

Crystal technology grows with its crystals The possibility of growing large boules of lithium niobate, up to 38.1 mm diameter, in lengths up to 20_3 cm, has

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ULTRASONICS. OCTOBER 1971