The book of Lantern Being a Practical Guide to the Working of the Optical Or
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In our eReader you can find the full English version of the book. Read The book of Lantern Being a Practical Guide to the Working of the Optical Or Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The book of Lantern Being a Practical Guide to the Working of the Optical Or
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At any rate, the same principle is involved. It consists of a pusher of wood working be- tween grooves on the lantern stage. Close against it is a box of slides with a powerful spring at the back of them, so that they are forced up against the pusher, the front one being always in the right position to be pushed for- ward on to the stage. The act of moving the pusher sends a picture on to the stage, removes that previously shown, which goes into another box, or drops down an inclined plane out ...of the way, and at the same time the lens is covered so that there is momentary darkness on the sheet. This darkness is, I think, preferable, and less trying to the eyes of the audience than if the actual change of picture took place visibly.
Other forms of carriers provide in a different manner for the lens being covered at the moment of change. One very good one consists of a pair of wings, which open and close automatically over the front of the objective lens as the change is made. In this case the first picture seems to darken down on the screen towards the centre, 'the reverse action immediately discovering the next slide.
What to read after The book of Lantern Being a Practical Guide to the Working of the Optical Or?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Cradock Hepworth to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
At any rate, the same principle is involved. It consists of a pusher of wood working be- tween grooves on the lantern stage. Close against it is a box of slides with a powerful spring at the back of them, so that they are forced up against the pusher, the front one being always in the right position to be pushed for- ward on to the stage. The act of moving the pusher sends a picture on to the stage, removes that previously shown, which goes into another box, or drops down an inclined plane out ...of the way, and at the same time the lens is covered so that there is momentary darkness on the sheet. This darkness is, I think, preferable, and less trying to the eyes of the audience than if the actual change of picture took place visibly.
Other forms of carriers provide in a different manner for the lens being covered at the moment of change. One very good one consists of a pair of wings, which open and close automatically over the front of the objective lens as the change is made. In this case the first picture seems to darken down on the screen towards the centre, 'the reverse action immediately discovering the next slide.
What to read after The book of Lantern Being a Practical Guide to the Working of the Optical Or?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Cradock Hepworth to read onlineMoreLess
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