The use of this table will often avoid delays by giving the customer's purchasing division an idea of the approximate cost. If, upon inspection of a returned instrument, it is found that the cost of reconditioning will be in excess of normal charges, the customer is advised the maximum cost, and no work is done until a reply is received.

The procedure that is followed in reconditioning a returned instrument is to clean it thoroughly; check and re-solder any connections that may have weakened; replace or repair any component part that has become worn, deteriorated, or damaged; tighten all assembly and mounting screws; clean the panel and polish the cabinet.

It is then sent to the laboratory for final test and recalibration. The instrument must pass the same test as a new instrument. If an obsolete type, it is tested under the specifications that were used when it passed through the laboratory originally. Because of the careful and complete reconditioning in our shop and accurate testing in our laboratory, we are able to guarantee an instrument for one year, which guarantee is identical to that which applied to it when it was originally sold. — H. 11. Dawes a chart for use with the type 516-c radio-frequency bridge

• FOR ACCURACY and flexibility, made with a series-condenser substitu-measurements with the Type 516-C tion. A fixed condenser of the appro-Radio-Frequency Bridge are ordinarily priate capacitance is first placed across

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