Rees 1820
Machinery
Another Fine Quality Print from Martin2001
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Legend to the illustrations:
Block machinery at Portsmouth
Shaping engine.
The shaping engine consists of a double wheel, called its
chuck, in which ten blocks are fixed at once. These being turned
rapidly round, a gouge is fixed to as to intercept them, and form their
external surfaces to segments of the circles in which they all revolve.
This is the general principle of the machine. Its particular
construction is explained by Plate VI. where fig. 1 is an elevation;
fig. 2, an edge view; and fig. 3, a plan. The detached figure parts we
shall soon explain. The separate figures at X and Y, in the corner of
the plate, are introduced to explain the state of the block when it is
brought to this ingenious machine, and to show also the change made
upon it. Fig. X is a front view, and Y an edge view of a double sheave
block. The outlines shew the form of it when finished in the shaping
engine, and the dotted lines its form before it is put into it. Thus
the four angles are shewn as cut off in fig. X by the corner saw,
preparatory to giving it the elliptical figure it is to have. The other
view shows nothing cut off by the corner saw, the whole alteration
being made by the shaping engine. This figure also shows the state of
the mortises.
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Print Specifics:
- Type of print: Copperplate engraving - Original antique print
- Year of printing: not indicated in the print - actual: 1820
- Publisher: Longman, Hurst, Rees, Orme & Brown, London
- Condition: 1 (1. Excellent - 2. Very good - 3. Good - 4. Fair)
- Dimensions: 8 x 10.5 inches (20 x 25 cm), including blank margins (borders) around the image(s).
- Paper weight: 3 (1. Thick - 2. Heavier - 3. Medium heavy - 4. Slightly heavier - 5. Thin)
- Reverse side: Blank
- Note: Green color around the print in the photo is a contrasting background on which the print was photographed.
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