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.
20 MAGIC LANTERN WITH DIRECT CURRENT [Cn. I
If the slides are not marked, and the correct position must be determined for each individual slide during the exhibition, even the most expert operator is liable to make mistakes, especially when the slides are shown rapidly.
§ 24. Inspection of the room and lantern by the lecturer. — It
is highly desirable that the lecturer make himself acquainted with the room in which he is to speak, and inspect the lantern himself before the lecture hour. If the operator is with him it gives opportunity to establish pleasant relations, and to stimulate the operator to make the best exhibition possible. It also gives opportunity and time to make any slight changes necessary to insure a good exhibition. Foresight is always more satisfactory in its results than hindsight.
§ 25. Directions for the operator. — The lecturer should instruct the operator how he wishes the slides shown. There must be some signal for changing the slides. Preferably the signaling device is some form of electric signal on the operator's table, then he can see or hear it, but the audience will not be distracted by it, as when the lecturer has to speak to the operator, or hammer on the floor with the pointer, etc. (For signaling devices see the list of apparatus in the appendix).
The lecturer should direct the operator to light the lantern before the room lights are extinguished, and give ample warning. The operator should also be told to leave the lantern burning until the room lights are turned on.
SUGGESTIONS TO THE OPERATOR
§ 26. Testing the lantern. — Before every exhibition or demonstration the operator should make sure that the lantern is in good working order. This is only fair to the speaker who depends upon his illustrations which he has taken so much trouble and expense to prepare. If the slides are not well shown it injures the effect of the lecture or demonstration and makes it difficult or impossible for the speaker to make clear the subject he is treating. It also disquiets the audience; and should make the operator uncomfortable.