622 Implement Show at Bury St. Edmund's, 



90° to 100°, and with an expenditure of about 3-liorse-power. 

 This is certainly a meritorious invention deserving of notice. 



Messrs. Howard's Safety Steam Boiler and superheater consists 

 of a series of vertical tubes, amongst which the fire circulates 

 Avith great facility ; it is introduced in place of the ordinary 

 Cornish boiler for fixed engines, and appears to possess some 

 considerable advantages ; each tube has within it an internal one 

 rising up through the water space, dividing the water into 

 annular and central columns ; the current of heated air im- 

 pinging upon the tubes, causes the water in the outer spaces to 

 rise to the top and flow down the inner tubes ; an active circula- 

 tion through all parts of the boiler consequently results, and even . 

 hard water leaves no incrustation. The points of merit contended 

 for by the makers are — Safefi/, the bursting pressure of each 

 tube being calculated to be 2000 lbs. per square inch, and if, 

 notwithstanding, a tube burst no dangerous accident could 

 follow : Economy of fuel — In a 40-horse boiler steam is raised 

 to 80 lbs. pressure in 20 minutes with 2 cwt. of coal. We have 

 not seen these results, and merely state them as given by the 

 exhibitors. There is economy in using superheated steam, the 

 steam space or reservoir being exposed to the radiated heat of 

 the heating chamber. The different parts are well put together 

 and simple, no bolts or joints are exposed to the action of the 

 fire. One of these boilers is being employed to drive machinery 

 at the Paris Exhibition. 



One of the most attractive features of the Miscellaneous 

 exhibition was Eli W. Blakes stone breaker and ore-crushing 

 machine, exhibited by H. K. Marsden, of Soho Foundry, Leeds. 

 This invention has the merit of simplicity and efficiency, being 

 capable of smashing up granite and swallowing large sized 

 stones. A vertically suspended jaw, with an indented or 

 furrowed surface, is made to play backwards and forwards, 

 coming in contact with a similar fixed surface. The opening 

 being widest at the top and contracting downwards, large masses 

 are converted into small fragments by a series of crunches, as 

 they descend. The motion is acquired by means of an elbow 

 joint leverage, working from an eccentric on the fly-wheel shaft; 

 driven by a 3-horse engine, it is capable of reducing 40 tons of 

 metal per day. A rotating screen working below receives the 

 crushed material, and separates it into two samples. With jaws 

 10 in. by 7, the price is 140/. The uses to which this ingenious 

 contrivance is adapted are many. The ironmasters in North 

 Lancashire and elsewhere employ it for breaking up slag for 

 road-making at a cost, it is said, of 2>d. a ton. It is used 

 for making concrete and asphalting, and for reducing ordinary 



