Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 220
ds faith-fully an enlarged view of objects too minute to beeven visible to the human eye; the aneroid barom- MODEL FLYING MACHINES, 219 etei% so sensitive that it will indicate the difference inlevel between the table and the floor; the thermostat,which regnlates the temperature of the water… … Diagram showing turbulent air currents produced when a flat plane is forcedthrough the air at a large angle of incidence in the direction A-B. of miles away; the automatic fire sprinkler; thesafety-valve; the recording thermometer and othermeteorological instruments; and last, if not of…
Aeronautics
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