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A. The Box about 4 inches long by about 2 outside diameter. B. The Reflector soldered to a brass screw, and mounted in the rear of the box. c. The slide to regulate the focus to the plate holder. d. The standard to the plate holder screwed to the slide. f. The plate-holder frame having two small ledges, , for the plate to rest upon. g.
A convenient way to fit this mat is to leave projecting lugs on each side at exactly the same distance from the ends, and cut notches in the plate-holder into which the lugs may closely fit. If this work is carefully done, the mat may be reversed both sidewise and endwise, and the lugs will fit the notches; if so, it is ready for use.
And the wind was sweeping vigorously across the open summit of the mountain. I put in my smallest stop, and prepared for short exposures. My instrument was a thing called a Tourograph, which differs from most other cameras in having the plate-holder on top of the box. The plates are dropped into a groove below, and then moved into focus, after which the cap is removed and the exposure made.
Locke tried to console her as they paced the library above, even though he realized that such consolation was hollow. It was perhaps half an hour later when suddenly the needle of the annunciator began to vibrate rapidly. All leaped to their feet and ran down the stairs to the Graveyard. At once Locke rushed to the camera, put in a slide, and took out the plate-holder.
The plate-holder must be loaded in a dark room or dark closet, with absolutely no exposure to daylight or any artificial light whatever except a very faint light from a dark-room lantern, a combination of ruby and yellow glass or paper. We should always test our dark room and light by means of a plate before we trust them to actual working conditions.
Your man will have to go over his ground again to replace these." "What's that contrivance?" asked Haigh, who was peering over my shoulder. "A spare dark-slide to use instead of the big plate-holder. Empty. Look, I'll put the two sound plates in there, and you can tell the Juggins that he can put those in his pocket and take the camera to a photographer man to get mended.
On the other side of the part to be investigated is placed a quick photographic plate shut up in its plate-holder, and is exposed to the rays emanating from the tube for a greater or less length of time. Hence, the part of the plate thus protected is less acted upon than the rest, and a shadow is produced upon the plate.
An exposure that would give a perfect picture at No. 8 may be very much under-exposed at No. 32 diaphragm. Having focussed our camera and set the stop, we then close the shutter, insert the plate-holder in the back of the camera and carefully draw the slide. Omitting to pull the slide is a common mistake with beginners. We are now ready to decide just what exposure to give our plate.
Back of the rubber plate was suspended a photographic plate in the plate-holder, and outside of this, between it and the rubber surface, were ten letters cut from thin copper. Dr. Morton proposed to see if he could not prove the existence of cathode rays between the poles by causing them to picture in shadow, upon the sensitized plate, the letters thus exposed.
The moment I lit it, however, the durned thing blazed up like a small volcano and I ran around the room for a minute or so with my thumb in my mouth. Then I discovered that the slide had not been withdrawn from the plate-holder. Well, the room was full of smoke and the baby was so badly frightened that we had to put him to bed before I could make another attempt.
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