The sciopticon manual, explaining lantern projection in general, and the sciopticon apparatus in paricular (1877)

Record Details:

Title:
The sciopticon manual, explaining lantern projection in general, and the sciopticon apparatus in paricular
Date:
1877
Publisher:
Philadelphia, J. A. Moore
Volume:
The sciopticon manual, explaining lantern projection in general, and the sciopticon apparatus in paricular
Leaf #:
000149
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Date Added:
July 19, 2022
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.

140 SCIOPTICON MANUAL. " The accompanying rude drawing will give you Borne idea of the plan. "The front A and the rest B are connected by two iron braces and slide up and down, for the desired focal distance, above the lens C. The ad- justable shelf D supports the object to be copied. The glass plate is laid upon the rest B over the opening, and a black cloth thrown over the top. The instrument is six feet in height, and eighteen inches square, and cost me about two days' labor. It is highly satisfactory." It will be understood that the ob- ject of roughing the gelatine, as in- dicated in the above letter, is that it m 31 may present an opaque surface to render the image visible, like the focus- ing ground-glass in a photographer's camera; this rough- ing also gives it a " tooth " to hold the markings. Ground-glass itself is sometimes used for obtaining drawings by superposition, which is rendered transparent by a coat of varnish, and it might be used in this case; it is, however, somewhat expensive. A surface is now produced on glass quite similar by what is called the ground-glass varnish. This surface after receiving the drawing may also be rendered transparent by a coat of common varnish, if dried in sufficient heat to prevent its again becoming opaque. ASPHALTUM VARNISH. —This common black varnish, flowed upon quarter-plate glass and allowed to dry, gives a surface which can easily be drawn upon with a