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The CRAMOPHO J"E

S,ptember, 1952

The perfect sapphire needle at an economical price

Users of 1M thorn needles will be aware of the importance of using a non-metallic needle if the preservation of records is to be considered. The long life and clarity of reproduction given by the sapphire are obvious attractions, but the indiscriminate use of any sapphire needle carries with it the risk of irreparable damage to records. The special features incorporated in the design of the new range of 1M sapphire tipped needles, the extremely fine tolerances worked to in manufacture. and the rigorous microscopiC inspection at every stage of handling and packing ensures complete safety for your records with fidelity of reproduction. 1M sapphire needles are made in four types to suit most pick-up heads, the length of trailer where used on autochangers, allowing the full loading of records to be played. The price of the standard, trailer and miniature is 8/7d. each (tax paid) and the microgroove is 9/8d. (tax paid). It is essential that the correct type for your pick-up is used and your dealer will be pleased to advise you on this.

These illustrations are taken from our leaflet < What makes a safe needle?' They show the groove of a standard 78 r.p.m. record magnified 200 times, one inch representing five thousandths of an Inch actual size. To this scale the thickness of the record would be shown as twenty inches. The radius of the tip of needle A is correct, being '0025", the radii of the t ips of the needles Band C are one thousandth of an inch less and more respectively. Conditions Band C will cause distortion, surface noise and damage to records . Ask your dealer for a copy of this leaflet, which gives detailed information on sapphire needles and their use. The following poInts summarize some of the superior qualities of 1M sapphires.

e It e e It e

Synthetic sapphire, longer lasting, uniform and free from flaws . Sapphire tip inserted into shank before forming ensures absolute concentricity. Dural shank, no inherent audible frequency periods, minimum weight. Shank shaped to reduce record wear with no loss of vibration transmission. Tip tapered to 45° , minimum surface noise consistent With safety. Tip diamond polished to a radius of '0025" plus '00025" minus '00010" for standard records and '0010" plus or minus '00010" for microgroove records.

needles

1M MASTER PRODUCTS LIMITED, 112-116 NEW OXFORD STREET, LONDON, W.C.I. Tel. MUS 7878 (20 l ines)