crown-sheet

Now in the case of a steam-boiler, when the water, having been reduced too low, is allowed suddenly to foam up on the overheated crown-sheet of the furnace, there must be just that sudden or instantaneous conversion of heat into force which may take place when the current of the electrical discharge passes through the gnarled fibres of an oak.

The Atlantic Monthly, Volume 02, No. 08, June 1858 Various

The lurid glare from the white fires that curled and writhed under the crown-sheet flung wide upon flying right-of-way and the woods on either side, and played with the swirling ribbon of steam that was hissing back from the dome.

Every Man for Himself Hopkins Moorhouse

He knows that the crown-sheet of the fire-box is bare, and that any moment it may give down and the end will come.

The Grafters Francis Lynde 1893

There is about one chance in a thousand that Callahan's crown-sheet won't get red-hot and crumple up on him in the last twenty miles.

The Grafters Francis Lynde 1893

Did you know (he declaimed triumphantly, shedding the opera-cloak to reveal an anorak) that during WWII there were a number of accidents (all crown-sheet failures) in American locomotives in use here which were caused by the inability of British footplatemen to read their modern and sophisticated Klinger reflex-type water-gauges?

Libertarian Blog Place 2009

Did you know (he declaimed triumphantly, shedding the opera-cloak to reveal an anorak) that during WWII there were a number of accidents (all crown-sheet failures) in American locomotives in use here which were caused by the inability of British footplatemen to read their modern and sophisticated Klinger reflex-type water-gauges?

Libertarian Blog Place 2009