A MAHOGANY ANGLE BAROMETER, PROBABLY AMERICAN, FIRST HALF 19TH CENTURY, formed as a right angle, each arm inscribed with increments on paper laid on wood flanking a central square corner--30½in. high, 24in. wide

Recommended features

• • 

  • 10 jewels that made history — and changed the market

    To mark 25 consecutive years as market leaders the record-breaking price for the Winston Pink Legacy diamond in Geneva, we look back at historic pieces sold at Christie’s

• • 

  • ​Collecting guide: Gallé glass

    In the late 19th century Emile Gallé’s vibrant glassware helped to transform ideas of what art could be. Specialist Carina Villinger shares her insights