134 W. & L. E. GURLEY, TROY, NEW YORK 



I i... ;;. I><-\i.- for n-ilin-inu' i|ii:intiiy of oil used 

 as :i rmt r in \\rlls. 



If near a suitable electric circuit, an electric heater can be 

 used in the end of a ?4 inch galvanized pipe, the heated end 

 resting on the bottom of the well and the pipe being long 

 enough to extend through the floor of the register house. The 

 heater should be used only in extremely cold weather. A 

 rheostat that could be attached to the under side of a float and 

 which would turn on the current when the water was 34 degrees 

 Fahrenheit would be desirable for economy. If the water in 

 the well is over-heated, everything in the register house will be 

 covered with a heavy coating of frost and thus interfere with 

 the working of the register. 



The type of house to be used at any station is selected after 

 consideration has been given to the three elements, utility, 

 safety, and appearance. If a station is to be operated all year 

 round the house must be large enough to allow the observer to 

 go inside during inclement weather and to pass conveniently 

 around the register table while inspecting or adjusting the 

 register. Plenty of light in the shelter is very desirable when 

 setting the gage height, changing the record, or otherwise 

 adjusting the register. For a permanent field installation a 

 concrete well and shelter, which will also afford fire protection, 

 (Figs. 67 and 68), are recommended as a matter of economy. 



