Double-Hung Window with Insect Screens - Patent Diagram & Technical Details #312858 (License: Personal Use)

This detailed technical illustration shows a double-hung window assembly with two independently operable sashes, each fitted with a fine-mesh insect screen (labeled 15). Key structural elements include side jambs (10), rails (16, 21), and locking mechanisms (23, 23a), designed for secure screen retention and smooth vertical movement. The diagram reflects early 20th-century architectural engineering focused on functionality, airflow, and pest exclusion.

Used in historical architecture articles, patent archives, restoration guides, or educational content about window evolution; targets users researching vintage building systems, DIY screen repairs, or heritage home preservation.