APPENDIX. 



Since the above went to press, Mr. Netiman, the designer of the machine 

 described on page 21, has submitted the design of a second machine. It consists 

 of a vertical revolving axis bearing three hollow, circular, horizontal discs, which 

 are heated by steam which is led into them through the axle from above. In 

 contact with the upper surface of each disc, but attached to a separate fixed 

 support, is a spiral guide which starts at the centre of the disc and ends at the 

 circumference. The seed is fed into the centre of the uppermost disc, by the 

 revolution of which it is forced round and round the spiral guide until it reaches 

 the circumference. Here it falls into a collector which delivers it into the 

 centre of the second disc. After thus passing over the three discs the seed 

 leaves the machine and is sacked. The discs are about one metre and a half in 

 diameter and revolve at the rate of about fifteen revolutions per minute. As 

 the spiral passes round the axis seven times on its way from the centre to the 

 circumference, it follows that the seed travels a distance of between twelve and 

 fifteen metres on the surface of each disc. 



No machine of this type has yet been completed and therefore any criticism 

 of it must be purely theoretical. From a consideration of the design it seems 

 not improbable that trouble may be encountered through the same seed remaining 

 too long in direct contact with the steam-heated surface of the discs and thus 

 being damaged . Should actual trial show that this is not the case, the machine 

 should prove satisfactory as soon as the correct adjustments have been found to 

 give the requisite temperature. The temperature could be controlled either by 

 regulating the steam pressure as in other machines, or, if electrically driven, by 

 regulating the rate of revolution. In the latter case the control could very 

 easily be made automatic. 



For further particulars apply to Mr. Neuman, 6, Sharia Eniad el Din, Cairo. 



