360 



JOURNAL OP HORTICULTURE AND COTTAGE GARDENER. 



[ Jsoveinljer 7, 1872. 



bustion. The circulation in this boiler "will be rapid. Its chief 

 fault is that it is fed from the upper part of the boiler, and is 

 more suited to burn coke than coal or cinders; -with this excep- 

 tion we have no doubt it Trill prove an efficient boiler. 



Kg. 1. 



The next stand was that of Thomas Green & Sons, Smithfield 



Ironworks, Leeds, who had a boiler for competition (figs. 1, 2, 



■", 4 l , which requires no brickwork for setting. It is of the shape 



or a saddle boiler, 4 feet long, 20 inches wide, and 30 inches 



or where the boiler had to be often exposed to view. 'We do not 

 think any boiler where the products of combustion are not 

 passed round the outside of the boiler has a chance in com- 

 petition with those boilers which are completely surrounded 

 with a flue; we were not, therefore, surprised that this boiler 

 was not mentioned by the Judges. But for a boiler to stand 

 complete by itself, without any masonry or other fittings being 

 required, we think it worthy of very honourable mention ; and 

 as the shelves are so contrived as to extract a great portion of 

 heat from the smoke, we think it would economise the greatest 

 portion of the heat. Fig. 5 represents Green's duplicate boiler, 

 two boilers so connected that they can be worked conjointly or 

 separately. 



Stand No. 56, Messrs. Hartley & Sugden, Atlas Works, Halifax, 

 exhibited several forms of boilers — independent tank boilers, 

 independent dome-top, saddle, and conical boilers — called inde- 

 pendent because, like the one last mentioned, they require no 

 brick-setting. They also exhibited a wrought welded saddle 

 boiler, with check-back and extended water-way, which obtained 

 the gold medal in competition. This boiler (fig. 6) has an aper- 

 ture left in the back through which the smoke passes, and is 

 conducted by means of midfeathers on the exterior of the 

 boiler, so as to pass round the whole of the surface before it 

 ascends the chimney. The setting of the boiler is very good, 

 and the extended water-way a very valuable means of extract- 

 ing heat from the fuel, which rests on it at the farther end, and 

 which is, consequently, prevented from being too rapidly con- 

 sumed, as it is beyond the draught from the firebars. We have 

 little doubt that this is a very simply-constructed, efficient, and 

 economical boiler, and from its obtaining the gold medal at 

 Birmingham it has confirmed our previous impression that there 

 was hardly any better boiler than a well-set saddle, though, of 

 course, the check-end and extended water-way add much to its 

 efficiency. The patent independent dome-top boiler is a decided 



CROSS SECTION. 

 Kg. 2. 



LONCITU01NAL SECTION 

 Fig. 3. 



FRONT ELEVATION 

 Fig. 4. 



highland has two water-shelves, placed one above another, 

 round which the flames have to pass. It is also fitted with a 

 sole plate, and has two upright tubes at the further end of the 

 firebox, connecting the lower sole plate with the bottom water - 



Gold Medal boiler. . 



E£ = TiCH ON LINE A 



C01LGR ^=e- 

 WlTHOUT BRICKWORK OR FITTINGS 



Fig. 6. 



shelf. The outside of the boiler is covered with hair, felt, or 

 other non-conducting material, and encased with wood. The 

 boiler has a very neat and finished appearance, and would be 

 very suitable for any situation where space was a desideratum, 



improvement on the conical, having the flow-pipe on the highest 

 point, and it is fitted with a flue-feeder with sand rim. This, 

 like Green's boiler, which we have previously mentioned, 

 would be very suitable for erection in any place where the 

 boiler is often seen, or where there is no room laterally for 

 brickwork. 



In the next stand the North Staffordshire Engineering Com- 

 pany exhibited some of Stevens's Trentham Improved Cornish 

 toilers. These are modifications of the old Cornish boiler, 

 which will be well known to most of your readers. Their chief 

 objection is their length, but the principle on which they are 

 constructed is good. 



Stand No. 5S was occupied by Mr. Henry Ornison, of Chelsea, 

 who has been so long known for the efficiency of his boilers. 

 He showed two forms of convoluted boiler, and a flued Cornish 

 boiler. The convoluted boiler, of which we give a drawing 

 (fig. 7), has the external form of a large saddle boiler ; it has, 

 however, as the drawing shows, an interior wrought-iron water- 

 way, somewhat of the form of a letter H laid ou one side, and 

 the interior of the saddle boiler has convoluted hollow gills, 

 which fit into or between the spaces of the internal boiler. 

 The fire passes all round the internal water-way, and through 

 a series of small holes left in the upper part of the saddle 

 boiler. In setting the boiler the four corners are elevated 

 about 3 inches on small fire-lumps, so that part of the fire on 

 each side the boiler is deviated to the external surface of the 

 boiler, so that every part of the boiler is exposed to the direct 

 action of the ignited fuel. This is a very powerful boiler, with 

 free circulation, and being made of wrought iron, is not liable 

 to fracture from uneven expansion. 



Stand No. 58a was occupied by Mr. Wright, of Birmingham, 



