

THE MANOMETERS. 



43 



The remaining features are better seen in the photograph (Plate 2), 

 where the manometer house is represented with the plate-glass front 

 removed. The end to the right and the top of the house are also of 



Fig. 24. 

 "Manometer house" for the calibration and comparison of instruments, etc. 



glass, though the latter is usually covered with a thick woolen pad and 

 the former with a flannel curtain. The front is also provided with a 

 flannel curtain (not seen in the figure), which may be parted at con- 



