18 Ihilh'liiì (le ht Socìctc KntomoUxjiquc d'Eyijple 



rise in Ihe cost of their insurances. The Hol Air machine 

 aiso proved a success, but was objected to on account 

 of the hui^e space it retjuired and its somewhat limited 

 output. 



Both these machines were intended as models only, 

 and were intended to demonstrate a principle. That they 

 tailed to raise much interest was because no one was 

 compelling the Ginners to undertake the destruction o- 

 worms in cotton seed and consequently they were adop' 

 ting a waiting attitude before introducing costly ma- 

 chinery. 



The results of the meeting showed that dinners 

 would object more to any machine eni])l()ying a poisonous 

 or explosive gas than to a machine whose action was 

 based on the application of heat. The Ministry of Agri- 

 culture consequently decided to elaborate a machiiie on 

 the latter lines and to have a working model erected. 



The contract was given to Messrs T. Cook and Sons, 

 Boulac. in .hinuary 191Ô. and the machine was expected 

 to t)e delivered by the end of Fe})ruary. Owing to the 

 war delivery was not actually made until November 

 1915. 



The machine is really a very simj)lc one. In its main 

 lines it consists of a furnace for the generation of tlie hot 

 air, a hot air chamber though which the seed passes, 

 and a motor. 



The hot air chaml)er is a rectangular box, of iron, 

 isolated on the outside by asbestos to avoid loss ofheat. 

 Internally there are four endless bands made of iron 

 chains, with trays on which the seed is carried. By 

 a contrivance the seed after having been carried nearly 

 the whole journey of the upper surface of the upper 



