1851 Victoria and Albert at the opening of the crystal palace by Henry Courtney Selous (Victoria and Albert Museum, London) detail
The Crystal Palace exhibition (the Great Exhibition of the Works of Industry of all Nations), the first World's Fair, was a major triumph for Prince Albert (to the right). Prince Albert hoped to make industrial products artistic. It was held in an iron framed glass-walled building designed by William Paxton that burned down in 1936 (Hitler's Luftwaffe did not remove it). The boy in tartan is the future Edward VII and the girl beside him is Princess Royal Victoria. I believe the Lady behind the Princess Royal is Duchess of Kent Victoria. One of the Ladies (to the left?, holding Victoria's train to Prince Albert's left?) is presumably Harriet, Duchess of Sutherland.