The use of window glass fragments as time diagnostic artifacts is an atypical, but well-established technique in historical archaeology—founded on the universal increase in window glass thickness through the 18th and 19th centuries. For sites with an abundance of architectural artifacts and a paucity of other time diagnostics or historic documentation, it may be the only means of ascertaining a construction date for a structure. However, when construction dates are known, window glass fragments may provide another benefit. For this analysis, window glass thickness is used as a key variable in a spatial analysis to test for the presence of multiple church construction events at the Unity Presbyterian Red Brick Church Site. This historic site is of crucial significance in recounting the history of the Unity (Latrobe) Presbyterians in southwestern Pennsylvania.

中文翻译：

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从窗户到墙壁

使用窗户玻璃碎片作为时间诊断文物是历史考古学中一种非典型但成熟的技术 - 建立在 18 和 19 世纪窗户玻璃厚度普遍增加的基础上。对于拥有大量建筑文物和缺乏其他时间诊断或历史文件的场所，它可能是确定结构建造日期的唯一方法。然而，当建筑日期已知时，窗玻璃碎片可能会提供另一个好处。在此分析中，窗玻璃厚度被用作空间分析中的关键变量，以测试 Unity Presbyterian Red Brick Church Site 是否存在多个教堂建造事件。