LUerury and PhUosopUieal hittUigrnce. 



258 



tlievhave hitherto operated upon, they 

 fin(l tliat a quantity of limestone, frouj 

 three to six-eighths, by weight, of the 

 slags or cinders, is required to reduce 

 the metal to a proper state for the sub- 

 sequent operation, those slags which 

 are poorest in metal requiring the 

 largest dose of lime or limestone. — Re- 

 pertory of Arts. 



To JOHN SHAW, of Mary-street., Fitz- 

 roy-square, London, for a new me- 

 thod of mn/cing Bricks by machinery. 

 The patentee's method consists in 

 forcing the day or composition of the 

 brick to be made, into its mould, by 

 mechtanical pressure. A hopper which 

 is supplied with tlie material, clay, is 

 exposed to the revolving arms of an 

 horizontal axle in communication with 

 tlie first mover; this arrangement 

 operates to divide or beat the material 

 into small portions, and to force it 

 down into a mould of the usual figure, 

 in which it receives the necessary pres- 

 sure by the application of an horizontal 

 {)islon. The action of this is produced 

 )y the conversi(m of the direct circular 

 motion of a wheel into the alternate 

 rectilinear one of tlie pressing rod or 

 piston ; the wheel is excentric, and its 

 periphery applies to the angular joint 

 of two connected bars, the angle they 

 form at the joint becoming of greatei- 

 or less acuteness as (he different parts 

 of the wheel arrive at it. The length 

 of the bar thus compounded is greater 

 when the longer radius of the wheel 

 acts upon the joint or their angle is 



[April 1, 



most obtuse, and the forward or acting 

 motion of the piston is then obtained. 

 When the brick is made, a lever ope- 

 rates by the action of a pin, to open the 

 end of the mould, and release the brick 

 now completed in its form, and which 

 is next taken from tliis place of deli- 

 very by the revolution of an endless 

 web. 

 To JACOB PERKINS, of Fleet-stteety 



London, for certain improvements in 



the construction of fixed and portable 



Pumps. 



In this pump, the suction pipe is en- 

 larged so that from the water rising more 

 slowly under the action of the pump, 

 all extraneous matters which are hea- 

 vier tiian water, as sand, &c. are allow- 

 ed time to subside by their weight 

 The patentee considers that with these 

 pumps thechoaking on board ship will 

 be obviated, and tliat they will conse- 

 (luently reduce the risk to which ships 

 are exposed in such circumstances.' 

 The plunger and pump-box are so 

 combined that a forcing stroke is made 

 both by the ascent and descent of the 

 plunger ; and a great increase of water- 

 way is ensured by rendering the valves 

 distinct from the piicking of the piston 

 bucket. Pumps on this construction 

 may therefore be considered as possess- 

 ing peculiar advantages for the com- 

 mon purposes of raising water, or oa 

 ship-board. Such a pump can also be 

 readily converted int« a forcing-pump 

 or fire-engine. 



\ 



VARIETIES, LITERARY AND PHILOSOPHICAL 



Includiny Notices of Works in Hand, Domestic and Foreign. 



AS a curiosity of art, and as a per- 

 formance of great social and com- 

 mercial worth, we have introduced a 

 specimen of the style of a note offered 

 to the Bank of England, and to the 

 Country Bankers of the United King- 

 dom, by Messrs. Perkins, Fairman 

 and Heaih, The execution of t!iis 

 note is in several respects inimitable ; 

 and its adoption would be creditable to 

 the moral feeling, and advantageous to 



. the interests of every country banker. 

 Of course we feel gratified in promot- 

 ing and recommending it us a means of 



. preventing forgery, and thereby saving 

 deluded victims from an untimely end. 

 We understand that notes executed in a 

 similar style, with ornaments adapted 

 to local circumstances, will not cost a 

 banking firm more than one fourth in 



adiUtion to the cost of the present 



clumsy and imperfect productions. It 

 seems, tlierefore, highly culpable in 

 any banker to continue to afford faci- 

 lities to forgery by persevering in a base 

 currency, which may be imitated by any 

 engraver's apprentice. It seems evi- 

 dent that if the Government Committee 

 had adopted this note for the Bank two 

 or three years ago, at least one hundred 

 lives might have been saved ; and five 

 times the number rescued from a cruel 

 and iguon)inious transportation. 



By favour of our intelligent corres- 

 pondent, Mr. Mawe,of the Strand, weare 

 enabled to lay before our readers a fac 

 simile representation of the great dia- 

 mond lately brought from India, for 

 which the Company ask 30,0001. Mr. 

 M. being permitted to mould it by 

 the favour of the chairman of the East 

 India Company. It is by far the larg- 



