The Dutch cO-shaped face is obtained by a die of the required section, and the curved slab, as it comes from the machine, slides over a mandrel which is lubricated by a current of water (Fig. 405), and is there cut into suitable lengths, while a fixed wire divides it into two parts, its breadth being double that of the tile.

Fig. 405. Cutting Machine for Curved Tiles (Schlickeysen).

By increasing the curvature of the die we obtain the shape of the semi-cylindrical Roman tiles. As they are conical, we place them, when they come from the mandrel cutter, on another conical mandrel shaped like the tile, and with an iron wire we take off the parts which project on each side (Fig. 370). The tile then is of the required shape (Fig. 405, to the left).

Another process, less economical, however, consists in expressing the paste in the shape of a half-cylinder bounded by a flat surface, thus having the appearance of a gas retort. An iron wire cuts off the flat part A B (Fig. 370), which is thrown under the machine, and the curved part is taken to a mandrel and shaped conically as above.

Particulars Of Tile Presses

Maker.

Number.

Pulleys.

Weight.

Horsepower.

Output Hour.

Price in Francs.

Remarks.

Dimensions in

Metres.

Number of Turns.

Without Moulds.

Complete with Moulds, but without

Matrices.

HAND AND LEVER PRESSES.

Chavassieux (Fig. 388)

...

..

..

1725

• • •

150-180

2000

2800

Single carrier.

• • •

• • •

...

2IOO

4

3OO-350

2520

3150

Two carriers.

Joly

( Fig. 387). (Fig. 389).

2

..

• •

1300

1/4

• • •

1700

1800

Extra moulds cost from 100 to I50fr.

I

...

..

1800

2/3

• • •

2100

2200

..

.67-.O8

..

1000

1/2

2OO-25O

1400

1500

Crank press.

Laeis et Cie. .

a

..

...

620

• •

I50

700

1200

b

..

..

1250

.. •

170

1200

1700

SCREW PRESSES WORKED BY STEAM.

Boulet (Fig. 386) .

small

.5-.08

130-150

1500

I

250-300

• • •

• •

large

.5-.08

130-150

3000

I

300-400

.. •

• • •

Johnson (Fig. 385)

• • •

...

..

• • •

• • •

• •

• ..

• •

Laeis et Cie.

• • •

• ••

• •

2500

1.5

200

2400

3000

REVOLVER PRESSES.

Boulet (Fig. 393) .

...

.75-.11

215

5500

1

500

• • •

• • •

Chamb. Belon (Fig. 399)

..

...

• ..

• •

• •

• •

• • •

Chavassieux (Fig. 398).

• • •

..

...

4900

1

500-600

4400

5500

Jager (Fig. 394) .

• • •

...

...

5000

1-2

400-500

2700

8500

Groke (Fig. 395) .

...

...

...

3800

• •

400-500

8750

4100

Reduction of 25 per cent, on these prices.

Laeis et Cie. (Fig. 396).

...

65

3150

3

• •

2850

8450

Lobin (Fig. 397) .

• * •

1-.15

60

4000

1-2

500-600

8850

4600

Cam and knee-piece types, gradually reduced pressure.

The fitting ridge-tiles of the usual shape are made with screw or cam presses. As for those of complicated form or limited consumption, it is advisable, as matrices are very expensive, to make them by hand with plaster moulds of the desired shape, the moulds being constructed with the aid of models,