A Brass Navigational Parallel Rule marked for Wilfred O. White & Sons; image credit on full record.
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Instrument; Navigation Parallel Rule, White & Sons, Brass, 18 inch.
Large Brass Navigational 18-inch Parallel Rule, Wilfred O. White & Sons, Boston/New York/Baltimore, late 19th century, maker's name on lower parallel.... [more detail available via subscription]