Class A sheathed smokebox

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Mon Feb 6 11:23:38 EST 2023

"Lagging" is the asbestos underneath the metal cover or "Sheathing".Jimmy LisleSent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: NW Mailing List <nw-mailing-list at> Date: 2/6/23  10:21 AM  (GMT-05:00) To: N&W Mailing List <nw-mailing-list at> Subject: RE: Class A sheathed smokebox
   1.  It may be better to refer to what is here being called "sheathing," by its proper name, "lagging."  (Lagging was asbestos insulation, pressed into large slabs perhaps 4 inches thick, and perhaps a foot high and about 24 inches long, stacked along the outer shell of the boiler or the firebox wrapper sheet, all held in place by an outer sheet steel wrapper.)
   -- abram burnett, 
   Turnip Oil: the Alternative Fuel to Save the Planet

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