1306 
and on the water floats a glass floater, suspended on a cord, passing 
over a pulley, and consequently in case of a change of water-level 
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Fig. 1. Scheme of the arrangement of the self-recording porometer. Expla 
nation of letters and figures in the text. 
sets the pulley in motion. The force, with which this takes place, is 
exclusively dependent on the floating-power of the floater and quite 
