Machinery   Another Fine Quality Print from Martin2001

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.

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. Martin2001 Satisfaction Guaranteed Policy! Any print purchased from me may be returned for any (or no) reason for a full refund including all postage. eBay seller since 1998. Five-star service.