The earliest frame houses were covered with weather-boarding and this before long was covered with clapboards. The walls inside were sheathed up with boards moulded at the edges in an ornamental manner and the intervening space was filled with clay and chopped straw, and later with imperfect bricks. This was done for warmth, and was known as "nogging," following the English practice. When roofs were not thatched, they were covered with shingles split from the log by means of a "frow" and afterwards hand-shaved. The window openings were small and were closed by hinged casements, just as the houses in England were equipped at that time. Generally, the casement sash was wood, but sometimes iron was used, as was common in England. The glass was usually diamond-shaped, set in lead "cames." Emigrants to Massachusetts were instructed by the Company to bring ample supplies of glass for windows, but the supply ran short and in the poorer cottages and wigwams, oiled paper was in common use. This was an excellent substitute and supplied a surprisingly large amount of light. A brickyard was in operation in Salem as early as 1629, and everywhere along the coast clay was found and made up into bricks. Chimneys were built upon a huge stone foundation. The brick work began at the first floor level and the bricks were laid in puddled clay up to about the ridge line where lime was used as the chimney top became exposed to the weather. It has been claimed and denied that bricks used in the construction of certain old houses were brought from overseas. In general the claims may be disregarded. It is certain, however, that the Massachusetts Company at the outset sent over ten thousand bricks, stowed in the ballast with five chauldrons of sea coals for the use of the blacksmiths. At the same time came iron and steel, nails, red lead, salt and sailcloth. Even fourteen hundred weight of plaster of paris, appears in the list, priced at eighteen shillings per hundred weight.