1. 
   wheel barometer
   A mercury barometer in which the mercury tube is concealed in the back of the case and the reading is taken from a dial like a clock face. As the mercury rises and falls with air pressure changes, a weighted cord, connected by a pulley to a float resting on the surface of the mercury, causes the poi...
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   wheel-barometer
   A mercury barometer in which the mercury tube is concealed in the back of the case and the reading is taken from a dial like a clock face. As the mercury rises and falls with air pressure changes, a weighted cord, connected by a pulley to a float resting on the surface of the mercury, causes the poi...
   Found op http://www.antique-marks.com/antique-terms-w.html
   
   

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