Further Particulars respecting Wotlfs Patent Boiler. 43 



mackerel become tender and nutritious, and the mixture form a 

 valuable and cheap diet. 



The sprats will also answer prepared in a similar manner with 

 potatoes. 



XIII. Some further Particulars respecting Woolf's Patent 

 Boiler. By the Editor. 



An our seventeenth volume, page 40, we gave an account of 

 Mr. Woolf's invention for producing strong and durable boilers 

 for steam-engines and other purposes, with an extract from his 

 specification, and a quarto plate; but we confined ourselves prin- 

 cipally to his boilers composed wholiy of tubes, and calculated to 

 bear a vevv high pressure of steam. In the article alluded to, we 

 informed our readers that Mr. Woolf had in his specification also 

 stated that his invention was applicable to the boilers of steam- 

 engines already in use, and that he had given in his specification 

 illustrations of some of the methods by which this might be ef- 

 fected. 



A correspondent having requested to be furnished with further 

 information on this part of Mr. Woolf's invention, we willingly 

 devote a page or two to the subject. — In his specification Mr. 

 Woolf remarks, that " in cases where it may be wished to increase 

 the power or production of steam without employing the very 

 high degrees of heat, which boilers constructed on the ))rinciples 

 before described, [viz. entirely of tubes,] are capable of sustain- 

 ing, my invention may be applied to the common oblong boiler 

 now in very couimon use for steam-engines." He then points 

 out one method, by placing a row of lubes horizontally under 

 and connecting them with the oblong boiler ; and afterwards 

 describes a method by wliich a very powerful oblong boiler may 

 be produced, bv dividing it into an upper and lower part, and 

 connecting the t^vo bv vertical tubes. Of such a boiler we ha\e 

 given a vertical and horizontal section in Plate 1. (fig. 2 and 3). 

 Tiie horizontal section is taken through the middle of the ver- 

 tical tubes. 



Mr. Woolf remarks that " from the examples he has given" 

 in his specification " no person acquainted with the nature atid 

 uses of boilers caii be at a loss to apply his invention modificil 

 according to circumstances to any case that may present itself." 

 This is abundantly evident from the description and accompany- 

 ing plate given in our seventeenth volume, and in the present 

 short article : for instance, the benefit of Mr. Woolf's invention, 

 t-o far as concerns an increase of surface and consequeiK-e of 

 steam by means of tubci, may be vsecured to the common obloiig 



boiler 



