by Allen Hazen
Timz-- Thank you for reference. Edson/May is... one of the many serious holes in my reference library.
Rlsteam-- Thank you for the links! (For those who don't know about it, Rlsteam's website is avery valuable resource for anyone interested in (particularly but not solely) New York Central steam locomotives: bookmark it along with George Elwood's "Fallen Flags".)
I have seen the row of cylinders along the A-2's firebox referred to both as "overfire jets" and as "smoke consumers," so I have assumed that (in this context) the terms are equivalent: one describing the mechanism, one its function. The instruction manual is ... instructive! The New York Central seems to have thought of these appliances as things to use only under special circumstances, but I wonder whether something like them might be useful on a continuous basis. They "consume smoke" (useful if you want to look into the firebox to inspect the fire, and also if you don't want the railroad to get fined for making smoke in an urban area) by injecting more air into the smokebox (the steam jet apparently is just a mechanism to entrain air flow) topromote more complete combustion: smoke is "consumed" by burning the soot particles. But having more complete combustion is something you might reasonably want anyway! Any soot particle that goes up the smokestack is a particle of coal fuel that didn't get burned in the firebox, so didn't contribute energy to heating the boiler water: it is, in other words, wasted fuel. "More complete combustion," therefore, sounds like "improved efficiency in the use of fuel"! I know that modern (post the end of steam in North America) efforts at improving steam locomotive design (look for references to the engineer L.D. Porta, and to South African Railways locomotive "the Red Devil") have included schemes to get more air into the firebox so as to burn the fuel more efficiently: I've wondered if the "top hats" on the side of the A-2's firebox were a step in this direction, an important improvement in steam locomotive technology that (like the Giesl ejector) came too late to have more than a few experimental applications on U.S. locomotives!
Rlsteam-- Thank you for the links! (For those who don't know about it, Rlsteam's website is avery valuable resource for anyone interested in (particularly but not solely) New York Central steam locomotives: bookmark it along with George Elwood's "Fallen Flags".)
I have seen the row of cylinders along the A-2's firebox referred to both as "overfire jets" and as "smoke consumers," so I have assumed that (in this context) the terms are equivalent: one describing the mechanism, one its function. The instruction manual is ... instructive! The New York Central seems to have thought of these appliances as things to use only under special circumstances, but I wonder whether something like them might be useful on a continuous basis. They "consume smoke" (useful if you want to look into the firebox to inspect the fire, and also if you don't want the railroad to get fined for making smoke in an urban area) by injecting more air into the smokebox (the steam jet apparently is just a mechanism to entrain air flow) topromote more complete combustion: smoke is "consumed" by burning the soot particles. But having more complete combustion is something you might reasonably want anyway! Any soot particle that goes up the smokestack is a particle of coal fuel that didn't get burned in the firebox, so didn't contribute energy to heating the boiler water: it is, in other words, wasted fuel. "More complete combustion," therefore, sounds like "improved efficiency in the use of fuel"! I know that modern (post the end of steam in North America) efforts at improving steam locomotive design (look for references to the engineer L.D. Porta, and to South African Railways locomotive "the Red Devil") have included schemes to get more air into the firebox so as to burn the fuel more efficiently: I've wondered if the "top hats" on the side of the A-2's firebox were a step in this direction, an important improvement in steam locomotive technology that (like the Giesl ejector) came too late to have more than a few experimental applications on U.S. locomotives!