The aspect of the town was changing. It was no longer the village which Lewis Brantz saw on his visit in 1790, when he painted the sketch which is the first pictorial representation of the place extant.[43] In the old Military Plan the ground was compactly built upon. Outside of this plan the houses were sparse and few in number, and cultivated grounds intervened. Thomas Chapman who visited Pittsburgh in 1795, reported that out of the two hundred houses in the village, one hundred and fifty were built of logs.[44] They were mainly of rough-hewn logs, only an occasional house being of sawed logs. The construction of log houses was discontinued, the new houses being generally frame. Houses of brick began to be erected, the brick sold at the dismantling of Fort Pitt supplying the first material for the purpose. The houses built of brick taken from Fort Pitt were characterized by the whiteness of the brick of which they were constructed.[45] Brickyards were established. When Chapman was in Pittsburgh, there were two brickyards in operation in the vicinity of the town.[46] With their advent brick houses increased rapidly. With the evolution in the construction of the houses, came another advance conducive to both the health and comfort of the occupants. While window glass was being brought from the East, and was subject to the hazard of the long and rough haul over the Alleghany Mountains, the windows in the houses were few, and the panes of small dimensions; six inches in width by eight inches in length was an ordinary size. The interior of the houses was dark, cheerless, and damp. In the spring of 1797, Albert Gallatin, in conjunction with his brother-in-law, James W. Nicholson, and two Germans, Christian Kramer and Baltzer Kramer, who were experienced glass-blowers, began making window glass at a manufactory which they had established on the Monongahela River at New Geneva in Fayette County.[47] The same year that window glass was first produced at New Geneva, Colonel James O’Hara and Major Isaac Craig commenced the construction of a glass manufactory on the south side of the Monongahela River, opposite Pittsburgh, and made their first window glass in 1800. Both manufactories produced window glass larger in size than that brought from the East, O’Hara and Craig’s glass measuring as high as eighteen by twenty-four inches.[48] The price of the Western glass was lower than that brought across the mountains. With cheaper glass, windows became larger and more numerous, and a more cheerful atmosphere prevailed in the houses.