Which style of window has a series of small horizontal panes that open and close by turning a crank?

The style of window that features a series of small horizontal panes that open and close by turning a crank is known as jalousie windows. These windows are characterized by their unique design, where multiple narrow slats of glass or other materials can be tilted open or closed, allowing for ventilation while still providing some level of privacy and protection from the elements. The use of a crank to operate these slats allows for more precise control over airflow compared to other window styles.

In contrast, double-hung windows consist of two sashes that slide vertically, and they do not feature a crank mechanism. Casement windows are hinged on one side and typically open outward by turning a crank, but they do not generally have the series of small horizontal panes characteristic of jalousies. Bay windows are a different style altogether, formed by a series of panels that protrude from a building’s wall, creating a nook or alcove; they are not typically associated with the crank operation or horizontal slatting seen in jalousie windows.