Model Steam Locomotives
from what had been considered abject failure. The oil burner was afterwards applied to water-tube models in place of the usual spirit lamp. There was, of course, some economy in the cost of fuel and in the value of the fire by adopting this arrangement, but the author considers that the difficulties in the regulation of the fire and the lesser relative importance of the blast are against this scheme of firing. It works very well at an exhibition on short runs, but where the use of paraffin is resorted to, as providing the least dangerous fuel, the noise, smell, liability to sudden stoppage, high evaporation during inaction of the locomotive, and the pricking out of the burner nipple, which may be necessary at any moment, constitute grievous faults. Of course, the inductive action of the exhaust is still necessary in a moderate degree. Water-tubes in the fire298
