46 Proceedings of the Royal Irish Academy. 



in a closely fitting tube, projected through the side of a box and carried the 

 rotating disc, which was thus mounted with all its attachments inside the 

 box. One side of the box could be removed to adjust the apparatus, and 

 when re] mid quickly be made sufficiently air-tight The necessary 



electrical connexions passed through insulating plugs in another side of the 

 box. 



• any humidity the method followed was i" dry the 

 air inside the box in the first place by phosphorus peutoxide, then shut off 

 the m laining the phosphorus pentoxide, and stait a slow stream of 



air saMiated witli moisture into the box, an exit for the air being opened. 

 The air inside the • • >wly supplied with water-vapour, and 



dm _ _■• in humidity thi itions were continued. Knowing 



the volume of the 1»>\. and the amount of air entering and leaving it per 

 :id. it i- it any instant, assuming that 



complete mixiug tak and this can he facilitated by means of the 



E 



the volume of tin - ind the volume of air entering and 



leaving il pei second I' •■ denote thi vapour pei cc in the 



mi. and /' tin- water-vapour f the saturated air 



_ ■ 





which 





- i 



Hum: 



In j 1 the rate of production • c inst the time 



ut" the 1«'X - The humidity al 



point of the cut instituting the corresponding 



value 'if / in ' on. 



the hi in the enclosure 

 with \ . i ips, some of which 



d the metal knob i sitively. 



As of product ion increased up I 



, u hen more moistun ded. 



Whi . f the cm ve was differ- 



ent - ' e rubbing 



