28 



No machine of this type has yet been erected and so there are 

 no practical data on which to base an opinion. However, there is 

 little doubt that if the requisite size und position of the burners 

 are found by experience, the machine should prove as satisfactory 

 as the last machine and even easier to control, the maintenance of a 

 steady temperature in a gas-heated machine being a very simple 

 matter. 



For further particulars apply to Messrs. Joseph Baker & Sons, 

 Ltd., Willesden Junction, London. 



(15) The Egyptian Engineering Company's (Rose's) Machine. An 

 experimental machine of a somewhat novel type has been erected by 

 the Egyptian Engineering Company at Mansura. It consists of a 

 central heating cylinder surrounded by an outer cylinder, the space 

 between the two being divided by longitudinal partitions into three 

 sections along which the seed travels. The inner surface of the outer 

 cylinder carries a number of oblique flanges which, when the machine is 

 in motion, serve to propel the seed. This travels along the first section 

 at the end of which it drops into the second, which conveys it back 

 to the near end, where it drops into the third section, after travelling 

 through which it is shot out and sacked. The whole apparatus revolves 

 at about sixty revolutions per minute 'and the seed is kept in rapid 

 motion the whole time. 



The present model was originally designed to use the exhaust 

 gases of an oil-engine as the heating agent. With these, however, 

 it was found to be impossible to get a high enough temperature. 

 The machine was therefore altered to take steam. The original 

 cylinder was left, however, and as it was not made to withstand 

 high pressures, it has been found difficult to get the seed hot enough, 

 even with steam. A sample treated at 52 C. showed a mortality 

 of the worms of 94 per cent, and a germination of 50 per cent as com- 

 pared with 52 per cent in the untreated seed, showing that the machine 

 can be expected to give satisfactory results if the details of its con- 

 struction are modified so as to make it possible to reach the necessary 

 temperatures without difficulty. The chief modification proposed by 

 the firm's manager is the division of the space between the cylinders 

 into five sections, thus making the seed travel the length of the machine 

 five times instead of three. This would probably give the necessary 



