thermic syphon

English[edit]

thermic syphon (plural thermic syphons)

Alternative form of thermic siphon.
- 1941 January, “Recent North American Locomotives”, in Railway Magazine, page 27:
  […] combined heating surface is 6,151 sq. ft. (tubes, 530 sq. ft., flues, 3,275 sq. ft., firebox, with arches and thermic syphons, 415 sq. ft., and superheater 1,931 sq. ft.); […] .
- 1947 January and February, Cecil J. Allen, “British Locomotive Practice and Performance”, in Railway Magazine, page 39:
  The response to firing is remarkable, and though the 280 lb. pressure seems more in the nature of a reserve for emergencies than a continuous working figure, even with the present-day apology for coal it seldom fell below 250 lb., and could always be brought up to blowing-off point with little difficulty. To this liveliness of steaming the thermic syphons are doubtless the chief contributory.