Insect Exteeminatoes. 



Ill 



(Nntd 



a 



^ 



Fig. 28. 



DESCRIPTION. 



A— Cylinder. 



B — Steam from boiler. 



C — Main distributing pipe. 



D — Water glass. 



E-^Valve for draining cylinder. 



F — Valve for distributing va- 

 por. 



G, I and K— Valves. 



H — Pet cock. 



J — Opening for supplying ex 

 tract to cylinder. 



