Seven-flue_Stack_1834.png
Summary
Description Seven-flue Stack 1834.png |
English:
A seven-flue stack, showing how it would be cleaned by
climbing boys
, or with little modification by a human cleaning machine (a brush). In the diagram:
Comments might be influenced by:
|
Date | |
Source | Glass, Joseph ( 4 October 1834 ). " The Contrast -- Mechanical & Children Chimney-Cleaning ". The Mechanics' Magazine 22 (582): 1–3. |
Author | Joseph Glass |
Licensing
This image is in the
public domain
because it is a mere mechanical scan or photocopy of a public domain original, or – from the available evidence – is so similar to such a scan or photocopy that no copyright protection can be expected to arise. The original itself is in the public domain for the following reason:
This tag is designed for use where there may be a need to assert that any enhancements (eg brightness, contrast, colour-matching, sharpening) are in themselves insufficiently creative to generate a new copyright. It can be used where it is unknown whether any enhancements have been made, as well as when the enhancements are clear but insufficient. For known raw unenhanced scans you can use an appropriate {{PD-old}} tag instead. For usage, see Commons:When to use the PD-scan tag . Note: This tag applies to scans and photocopies only. For photographs of public domain originals taken from afar, {{PD-Art}} may be applicable. See Commons:When to use the PD-Art tag . |