We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
THE BOOK OP THE LANTERN. 65 to know how quickly this exchange takes place in the case of a bag of oxygen; but, as an experienced worker, I have no hesitation in saying that there is a marked deterioration in the quality of the lime-light, if the oxygen gas used has been kept for only 24 hours in a bag instead of being freshly made. The same rule will apply to the hydrogen gas in a greater degree, for the hydrogen passes through a porous diaphragm far more rapidly than can oxygen. But, in practice, the H bag is filled from the nearest gas-tap immediately before it is wanted. (Mr. Fletcher, of Warrington, has patented a method of preventing the smell of gas-tubes, by inserting a partition of tinfoil between the two layers of india-rubber which compose the tube. This foil stops the smell, by stopping endosinose. The same principle might, of course,, be applied to gas-bags. Here is a hint for manufacturers.) Other objections to the use of gas-bags are found in their initial expense, and the necessity for constant renewal, their bulk, and their liability to mechanical injury. In spite of these defects, I have always preferred to use gas in bags, rather than gas compressed in cylinders. My reasons for this choice I will now give. If the gases are compressed in cylinders, there is a great saving in trouble, as well as in bulk of apparatus; but I have hitherto set my face against them for the following reasons:—1. The pressure is so great, that the india-rubber tubes are apt to blow off; and, if tied on, may burst. 2. The light cannot be regulated at the jets and by the taps provided for that purpose, but the taps must be turned fully on, and the outrush of gas roughly F