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1911 Encyclopedia Britannica
A wind that under certain conditions blows over the escarpment of the Pennines, near Cross Fell from the eastward, when a helm (helmet) cloud covers the summit. The helm bar is a roll of cloud that forms in front of it, to leeward.
See "Report on the Helm Wind Inquiry," by W. Marriott, Quart. Journ. Roy. Met. Soc. xv. 103.
These files are public domain.
Chisholm, Hugh, General Editor. Entry for 'Helm Wind'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/h/helm-wind.html. 1910.