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Aviation History
1949
1949 - 0038.PDF
24 Advertisements, FLIGHT JANUARY 6TH, A Iffegv West an Frequency Indicator HE Western Model SI09 is a new Frequency Indicator especially designed for aircraft use. It is of the ratiometer type and has a circular scale having an angle of 270° and a length of 5f inches. This indicator is made for all standard aircraft voltages and normally indicates frequencies between 300 and 500 c.p.s. A feature of the indications is that they are independent of wave form and any normal variations in the supply voltage. The readings are accurate to within ± 1 per cent, of the maximum indicated frequency. The Indicator is unaffected by external magnetic fields and it is shielded against compass inter- ference. It is entirely self-contained and is supplied in a standard bakelite aircraft case (or panel mounting. WE sTON Aircraft Instruments SANGAMO WESTON LIMITED GREAT CAMBRIDGE ROAD • ENEIELD • MIDDLESEX. Telephone: ENFieM 3434 & 1242. WHERE PRECISION GOMES INTO THE PICTURE . . . . View N.W. from Toba Inlet, B.C. Coast, to Mt. Waddingcon (on horizon,distance 75 miles). Reproduced by courtesy of the Government of British Columbia, Williamson Photogrammetric equipment is playing an ever increasing part in precise air survey throughout the world. Pursuing a policy of continuous and active development, the Williamson organisation offers to Govern- ment and Civil organisations a range of precision air survey equipment backed by the resources of their technical staff. WILLIAMSON MANUFACTURING CO. LTD. Photographic Engineers LONDON In Canada: Wi'Hamsoti Company ofCanada Ltd., Toronto, ONTARIO.
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