Burners resembling F in
outward form are made with a pair of injector jets and corresponding air
orifices on each head, so as to produce a pair of names lying in the same
plane, "end-on" to one another, and projecting at either side
considerably beyond the body of the burner; these have the advantage of
yielding no shadow directly underneath. A burner of this pattern, viz.,
the "Wonder," which is sold in this country by Hannam's, Ltd., is shown
in Fig. 10, alongside the single-flame "Wonder" burner, which is largely
used, especially in the United States. Another two-flame burner, made of
steatite, by J. von Schwarz of Nuremberg, and sold by L. Wiener of
London, is shown in Fig. 11. Burners of the Argand type have also been
manufactured, but have been unsuccessful. There are, of course, endless
modifications of flat-flame burners to be found on the markets, but only
a few need be described. A device, which should prove useful where it may
be convenient to be able to turn one or more burners up or down from the
same common distant spot, has been patented by Forbes. It consists of the
usual twin-injector burner fitted with a small central pinhole jet; and
inside the casing is a receptacle containing a little mercury, the level
of which is moved by the gas pressure by an adaptation of the
displacement principle.
Pages:
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527