The lower sash, or both sashes, "slip" up through a slot in the frame header, into a slip pocket within the wall above the window opening. Also known as slip head, box head, jib and pocket window.
Drawing from Radford's "Brick Houses and How to Build Them", Fig.85:
More detailed info here:
http://misspreservation.com/2014/04/02/ ... t-windows/
Sliphead Windows
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