SIMPSON, STRICKLAND & Co., Ltd., Dartmouth <fe Teddington. 



) 



HORIZONTAL BOILER. 



downtake tubes (G). This circulation is the most important thing in a 

 water tube boiler, as it will be easily seen, that, as all water contains some 

 slight amount of solid matter, if no means were taken to prevent its deposit 

 in the tubes it would be only a question of a short time till the whole of the 

 tubes were blocked up and burnt out. With tubes arranged as shown, we* 

 find that in practice it is impossible for deposit to take place in the tubes, 

 as it is all washed out and deposits in the bottom drums. This we have 

 proved by experiment, and also by examining the circulation in a model 

 with glass ends, which we shall be pleased to show anyone interested. 

 A special feature of our boilers is that any one tube can be removed and 

 a new one put in without disturbing any other one. This is provided 

 for by spacing the tubes in lines and a little more than their own 

 distance apart. This arrangement also gives a boiler which steams very 

 well with natural draft and enables all the tube joints to be seen from 

 the furnace. The great advantages of the water tube boiler, are, ist that 

 it is very powerful for the weight and space occupied, and consequently 

 there is no difficulty in getting greater speeds than with other types, 

 without forcing excessively; at the same time a water tube boih : 

 be run under the strongest forced draft, if necessary, without its 1>< -:n.^ 

 possible to make the tubes leak, however careless the firing may be. 

 Another great advantage of this type is that it will steam well with very 

 inferior fuel. This is an advantage that will be much appreciated by those 

 who have difficulty in obtaining good coal ; it will also run an unlimited time 

 without having the tubes swept, which is a great saving in dirt and trouble. 

 Wood fuel is easily burnt in these boilers, as it is easy to arrange for a 

 furnace of great height. 



Taking all the above points into account we consider that the water tube 

 is the most generally satisfactory, providing it is properly made. It is, 

 however, to be observed that there are some on the market in which the 

 arrangements for circulation are so defective, that they can only be run 



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