She sat a long time looking at the receding line of candles reflected in the glasses and expecting (from tales she had heard) to see a coffin, or him, Prince Andrew, in that last dim, indistinctly outlined square.
Claire Quincy had donned reading glasses and was scrutinizing the letters as Fred O'Connor followed his notes and explained the information on Annie Quincy he had gathered at the library.
Pierre took one of the glasses and emptied it.
Fraunhofer further initiated the specification of refraction and dispersion in terms of certain lines of the spectrum, and even attempted an investigation of the effect of chemical composition on the relative dispersion produced by glasses in different parts of the spectrum.
In spite of the improvements in themanufacture of optical glass (see Glass) practically the same crown and flint glasses as used by John Dollond in 1758 for achromatic objectives are still used for all the largest of the modern refracting telescopes.
Concave glasses were introduced soon afterwards.
The vessels, especially those in which many differently coloured glasses were incorporated, required prolonged annealing.
Experiments were also tried with a violet-coloured glass, a violet opal, a transparent black and with glasses shading from red to blue, red to amber and blue to green.
Shield the glasses from the sun with my hat like this.
Coloured anti-glare glasses are provided.