VISUAL DESCRIPTION
This is an advertisement for "New WESTON Circular Scale Indicators, " which are a type of aviation instrument designed by Weston Electrical Instrument Corporation. The ad highlights the features of these instruments, such as their design for use with resistance bulbs for the measurement of aircraft engine oil and coolant temperatures. It emphasizes that they are engineered to maintain accuracy unaffected by variations in supply voltage. The scale angle is 270°, and the bezel length is approximately 1⅝ inches. These indicators also claim to be shielded against external magnetic fields and compass interference. They come in two versions: Model 301 designed for D. C. engines and Model 502A for A. C. , supporting frequencies from 25 cycles up to 5000 cycles. At the bottom, there's branding information stating "WESTON Aircraft Instruments" along with addresses in Newark (New Jersey), Chicago (Illinois), San Francisco (California), Boston (Massachusetts), London (England) and Melbourne (Australia). The image at the top shows one of these circular scale indicators with numerical values around its dial and labels indicating it's meant to measure engine temperature ("ENG TEMP").

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