The advance of photography : its history and modern applications (1911)

Record Details:

Title:
The advance of photography : its history and modern applications
Date:
1911
Publisher:
London : K. Paul, Trench, Trübner & Co., Ltd.
Volume:
The advance of photography : its history and modern applications
Leaf #:
00029
Language:
English
Subjects:
Motion Pictures, Motion pictures--Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
November 02, 2023
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HISTORICAL SURVEY room, then from each point of the poplar rays of light will travel towards the hole, and beyond that in straight lines to the wall. It is now clear that to the point a' light can only arrive from the point a of the poplar, which is Fig. 3. situated on the extension of the line a' o. Therefore this point of the wall can only reflect light, which in its colour and position corresponds to the point a. The same remark applies to the points / and g, and the result accordingly is that on the wall an inverted image of the tree is visible. An improved instrument was soon obtained by using instead of the room a small box (fig. 4) which had a r~— I Fie. 4. movable semi-transparent screen in place of the solid wall. On this screen the image of an object in front of the box is clearly visible, if a minute hole is made in the front side, which is best if composed of a thin tin plate. The light