Mounted within the housing are {HEAD ~ various components} of {TAIL ~ the draft sensing apparatus}, these components including a first support 48 in the form of a shaft, a second support indicated generally at 50, the second support being pivotally mounted on the first support 48 
of
Mounted within the housing are { HEAD ~ various components } of { TAIL ~ the draft sensing apparatus } , these components including a first support 48 in the form of a shaft , a second support indicated generally at 50 , the second support being pivotally mounted on the first support 48
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH