This section is from the book "Modern Buildings, Their Planning, Construction And Equipment Vol2", by G. A. T. Middleton. Also available from Amazon: Modern Buildings.
The glass to be of the best description of its respective kinds, free from all waves and air globules, and to be bedded in putty and back puttied and sprigged in.
Glaze the shop and showroom windows and doors with 1/4-inch British polished plate.
Glaze all other windows and doors with 26-inch seconds sheet glass.
All windows opposite escape staircases to be glazed with Pilkington's fire-proof glass.