density, or more precisely, the Specific Gravity. As PHYSICA L SOCIETY this quantity is used in the calculation of bulk deliveries and receipts —to mention but two tran EXHIBITIO N sactions involving large volumes or weights of oil— the measurement has to be of a high order of accuracy. TH E 37th annual exhibition of the Physical Society This is not easy and takes time, so an improved form was held at Imperial College, from 13th to 17th of the Westphal balance shown by STANTON April. While the general character of the exhibits INSTRUMENTS LTD. should prove a useful addition was, as is usual in these days, predominatingly elec to the equipment of an oil testing laboratory. This tronic, the interests of the oil industry were not instrument, by the use of two riders, gives direct completely unrepresented. readings of Specific Gravity from 0 to 1.0000 to an As an example of modern, compact design in accuracy within 0.0001. The glass plummet displaces apparatus, GALLENKAMP & Co. Ltd. showed a 5.0000 g. of distilled water at 15°C. and has a small Michie Sludge Test bath for four samples. The thermometer enclosed. The usual range of the overall dimensions are only 14 in. x 13 in. x 8 in. instrument can easily be extended to a Sp. Gr. of deep ; it is insulated with glass wool and fitted with 2.0000 by the use of a small platform and a circular a drain plug. The temperature control, by means weight. The balance is safely portable. of a Sunvic thermostat, guarantees the necessary ± All oil chemists whose duties include testing used 0.5°C. at 150°C. Special attention has been given lubricants rely at times on microscopic examination to the cooling water supply which ensures equal flow of solid impurities for the identification of abrasive constituents and the like. The ordinary optical microscope is most easily adapted to transparent objects—by transmitted light—and to use it for opaque bodies calls for a special technique and equipment. For occasional use in the oil laboratory there is no doubt that the TECHNE (CAMBRIDGE) LTD. Universal microscope would be a welcome tool. This instrument has been specially designed for the non-specialist and is easy to use. It is a reflecting microscope and provides normal or dark field illumin ation. Magnification is normally up to X320 but it will project an image on to a large screen with a magnification up to XG00. In normal use the image, when not viewed through the eyepiece, may be seen instead on a ground glass screen replacing it ; or on the table by aid of a small mirror. It is easily adjusted for photography and the complete absence of chromatic aberration in a reflecting instrument renders the production of coloured pictures possible. TECHNE also displayed a portable temperature control unit incorporating a heater and stirrer which may be clipped on the side of a laboratory vessel to control within ± 0.1°C. to each condenser and provision is also made for J. W. TOWERS LTD. have a neat design of thermometric observation of the inlet and exhaust thermostatically controlled viscometer bath where water. The pressure regulators and calibrated flow all ancillary gear is combined in a single unit. The meters are mounted separately on a wooden stand. viscometers are illuminated by means of a 10 in. All the components of this oxidation apparatus are fluorescent tube at the back, located behind a ground available as replacements when required. glass diffusing surface. Eight LP. viscometers may be located at the same time. This firm has also TOWNSON & MERCER Ltd. displayed, among produced an electric burner which functions as a other pieces of equipment, their Precision Constant Bunsen when gas is not available. This has a totally Temperature Bath. This design is such that the bath itself is entirely free from obstruction, all the control enclosed 000 watt heating element mounted in a elements being housed outside in a separate com refractory chimney with a switch at the base. partment where they can be easily adjusted, repaired BAIRD & TATLOCK (LONDON) LTD. have or replaced. The method of liquid circulation does designed an electrometric titrimeter fitted with a away with stirrers -and it is claimed, that under motor driven stirrer and an end point indicator unit favourable conditions, an accuracy of ± 0.01°C. can employing a cathode-ray tube. This apparatus may be obtained. A dual point thermostatic control be used for the determination of the Bromine Number unit automatically cuts out the boost heaters at a (LP. Standard Method, 130/51). They also had on desired temperature level and thus makes for ease view various types of meniscus magnifiers for use and precision when starting up the bath from cold. with burettes, thermometers, etc. These varied from a simple plastic lens to an illuminated model for a Apart from viscosity, the physical property of Beckmann thermometer. lubricants which is measured most frequently is the 36 Scientific LUBRICATION May, 1953
Industrial Lubrication and Tribology – Emerald Publishing
Published: May 1, 1953
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