An introduction to the study of the Diatomaceae . Illuminant. This may be either— (a) Oxy-hydrogen lime light. (b) Coal gas. (c) Paraffin. (d) Daylight. (a) The oxy-hydrogen light is probably the most con-venient for the majority of workers, two forms of jet being available— The blow-through. The mixing jet. The former is the safest for beginners to work with, theoxygen gas being blown through a hydrogen flame upon thelime cylinder, but the light is not so good as that obtainedfrom the latter, in which the oxygen and hydrogen are mixedin a chamber previous to consumption at the nozzle. Thenozz
An introduction to the study of the Diatomaceae . Illuminant. This may be either— (a) Oxy-hydrogen lime light. (b) Coal gas. (c) Paraffin. (d) Daylight. (a) The oxy-hydrogen light is probably the most con-venient for the majority of workers, two forms of jet being available— The blow-through. The mixing jet. The former is the safest for beginners to work with, theoxygen gas being blown through a hydrogen flame upon thelime cylinder, but the light is not so good as that obtainedfrom the latter, in which the oxygen and hydrogen are mixedin a chamber previous to consumption at the nozzle. Thenozzle of this jet should be fine in bore, rather finer thanwhen for use in the lantern ; by this means a nearer approachis obtained to the theoretical point of light. A very goodmixing jet, invented by Mr. Andrew Pringle (made byMessrs. Newton and Co., of Fleet Street, London), isprovided with a special cut-off tap, which in one movementcuts the oxygen off completely, and turns at the same timethe hydrogen down to a minimum, as shown in Fig. FIG. 6. 66 AN INTRODUCTION TO THE The limes should be of the hardest description ; Nottinghamlimes being the best we have tried. All good jets are providedwith an arrangement for turning the limes when they becomepitted, for if their use be continued in this state, the flame isliable to spurt sideways, and so crack the condenser. Thegas for the jet can be obtained compressed in steel author uses the oxygen from a cylinder provided with aBeards regulator which renders possible the adjustment offlame at the taps of the burner ; but he obtains the hydrogenfrom the mains—that is he uses coal gas for hydrogen. Theonly danger in this method of working is that unless theoxygen be turned on carefully, it may be blown round intothe mains and not only extinguish the light at the jet, butfurnish an unpleasant surprise to the next person whoattempts to light the gas in another part of the house. Withcare however this will not happe
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidintroductiontost00mill
