Optical projection: a treatise on the use of the lantern in exhibition and scientific demonstration (1906)

Record Details:

Something wrong or inaccurate about this page? Let us Know!

Thanks for helping us continually improve the quality of the Lantern search engine for all of our users! We have millions of scanned pages, so user reports are incredibly helpful for us to identify places where we can improve and update the metadata.

Please describe the issue below, and click "Submit" to send your comments to our team! If you'd prefer, you can also send us an email to mhdl@commarts.wisc.edu with your comments.




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.

96 OPTICAL PROJECTION diameter with a roll of woollen material. This is closed by gas-tight caps at each end, with proper nozzles. Ether is poured in to saturate the woollen, and the oxygen passes through the roll. The usual form of this generator sold in England is shown in fig. 56, the tube being double, each length with its own roll of saturated material, the two being connected by a U piece of brass tube. But in his own last construction Mr. Ives prefers a single tube about 14 inches long, which is laid flat, and has a nozzle with stop-cock pro- jecting up at each end. He also now prefers to use petroleum ether, which in the United States is a more common com- mercial product than in England, and volatilises at a lower Pro. 56.— Porous Generator temperature. It also contains no alcohol or water, some small quantity of which is always found in common ether. That is an advantage, but the lower vapour-point I regard as so far a drawback, sulphuric ether itself giving quite sufficient trouble in this respect to make its storage and carriage a matter of some anxiety. 1 Experiments in England snow that the best saturation is given by the tank, tank vapour requiring decidedly more 1 Since writing the above pages fundamental changes have been made in the construction of ether saturators; space here forbids further men- tion, but fuller details will be found in the appendix at the end of the book.—R. S. W,