Priming and Topping. Preparation of a boiler furnace before lighting fire. Priming consists of laying small coal over fire-bars. Topping is the laying of a transverse wall of coat a little distance inside furnace. Kindling wood, or fire from another furnace, is laid against topping to ignite it.
Priming Valve. Spring-loaded valve, on top of cylinder, that allows any condensed steam to escape as piston comes upward.
Prismatic Coefficient. Immersed volume of a vessel expressed as a fraction of a block whose length is that of the vessel and the shape of which is that of the immersed midship section of the vessel.
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