PLATE 8. 



A thermostat-room. 



In the center of the bidding and lighted by electricity. Ventilated in the isrne way a the photographic dark-roonu, i. e., by an exhaust-Ian 

 run by an electric motor. Three of the thermortaU were made by Bauich 8t Lorob. the fourth (felted) a a Rohrbeck. 



