Projection Apparatus (1917)

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.

Bausch & Lomb Optical Company Spectral Tube Holder for Projecting Spectra of Gases To show the spectra of gaseous elements it is necessary to use the transformer type of spectral tubes* in connection with a high voltage transformer or induction coil. The high voltage necessitates a special asbestos board holder for this tube to insulate it from the rest of the apparatus. The holder is illustrated in Figure 3. This holder is substituted for the ad- justable slit shown at the extreme left in Figure 1. A brass plate, secured to two posts by mille-' 1 nuts, holds the spectral tube in position. The plate has a slit which ful- fills the same function as the adjustable slit in Figure 1. Any good type of transformer or induction coil of about 10,000 volts capac- ity can be used for this work. Figure 3 *F. G. Nutting, Bulletin of the Bureau of Standards , Vol. IV. p, 511. 121