Aug. 31, 1888.] 



SCIENTIFIC NEWS. 



i95 



Our illustration shows one made by Messrs. Ponti- 

 fex and Wood for making pyramids of ice for table 



the crust of the earth are arranged is that of the Palaeozoic. 

 The term is taken from the Greek, palaios, ancient, and 



Pyramid Ice Box. 



decoration, for cooling rooms, etc. The brine tank is 

 made of wrought iron covered with wood, sawdust being 

 placed between the iron and wood. In this tank there 

 are four ice-moulds made of galvanised wrought iron, 

 pyramidal in form, and in each mould there is a spiral 

 agitator or endless screw, which is used to keep in motion 

 the water in process of freezing. The cold brine enters 

 the tank through a pipe at one end, and leaves the tank 

 at the other end. In this way there is a constant circula- 

 tion of the brine round the ice-moulds, and as the brine is 

 at a temperature below the freezing point of water, the 

 water in the moulds is soon frozen. The result is a 

 pyramid of clear ice, as illustrated. 



— «-^»^><^fe^ — 



ON THE GEOLOGY OF BATH AND 

 THE NEIGHBOURHOOD. 



'T'HE rocks which form the crust of the earth are 

 either stratified or unstratified. The former of 

 these have been deposited by the agency of water, and 

 lie one above the other, somewhat resembling the leaves 

 of a book. The strata do not occur indiscriminately, but 

 are arranged in definite order, and are so classed that 

 each formation is characterised by the fossils which 

 occur in it, representing, of course, the life of the period 

 during which the strata was deposited. 



The unstratified rocks underlie the stratified, or have 

 been projected into them by forces which are at present 

 imperfectly understood. 



The first great system into which the rocks forming 



soe, life, and is applied to the lowest system as holding 

 the most ancient or earliest-known forms of life, i Next 



Ice Pyramid, made by the Pyramid Ice Box. 



(For table decoration, and for cooling drawing, ball, and assembly 



rooms.) 



