French Empire Harp by Sebastian Erard, 19th Century

• Maple - Maple, native to North America, is a dense heavy timber from light to yellow-brown in colour. It has very little distincive graining unless it is one of the variants such as birds-eye maple or burr maple, so was not used extensively for furniture in 18th and 19th century, where cabinetmakers and designers preferred timbers with more distinctive features such as mahogany, walnut, rosewood and oak.
  
  Birds-eye maple has a seres of small spots linked by undulating lines in the grain, is highly sough and is used as a decorative veneer. Burr maple has larger and irregular grain swirls than birds-eye maple.
• Giltwood - Giltwood is used to describe a gold finish on furniture and other decorative wooden items, whereby a thin sheet of gold metal, called gold leaf, is applied to the surface for decorative purposes.
  
  Unlike gilding, where the gold leaf is applied over a coating of gesso, with giltwood the gold leaf is applied direct to the surface, or over a coat of linseed oil gold leaf adhesive.
  
  Most gold-finished mirrors will be gilded, whereas furniture with gold highlights will have the gold applied through the giltwood method.
• Erard - The distinguished Parisian firm Erard?s, makers of harps and pianos, were in business between 1777 and 1960.
  
  The business was founded by Sebastien Erard, who had been apprentice to a Parisian harpsichord maker for two years before establishing his own workshop in the rue de Bourbon. In 1786 the company expanded by opening a branch in London, and in 1789 his brother Jean-Baptiste joined as partner.
  
  Sebastien Erard obtained a number of patent registrations in both England and France, for design innovations to both the harp and piano, the most important being for the double-action harp in 1810, the forerunner to today's concert harp.
• Gesso - A mixture of plaster of Paris and gypsum mixed with water and then applied to the carved wooden frames of mirrors and picture frames as a base for applying gold leaf. After numerous coats of gesso have been applied, allowed to dry and then sanded a coat of "bole", a usually red coloured mixture of clay and glue is brushed on and allowed to dry, after which the gold leaf is applied. In painting, gesso is also used to prime a canvas prior to applying paint.

This item has been included into following indexes:

• musical instruments
  • harps 27
  • pianos 105