586 SEC. 14. METEOROLOGY. 



all variations in the atmospheric pressure, and announce it indirectly by 

 setting an electric clock-work into action, (d.) By connecting the two relays 

 with the same point, the utmost sensitiveness of the automatic adjustment 

 is reached, whilst the machines are in continuous action. 



III. The registering mechanism, which is connected with the self-regulating 

 barometer cistern, and moving in which the mercury in the barometer has no 

 work to perform. Attention is called to the following points: (a.) The 

 force moving the marking pencil is a considerable one, in consequence of the 

 multiplying gear ; the wheels have to revolve 80 times in order that the 

 cistern may move I mm. (6.) The registering mechanism allows, without 

 losing anything of its simplicity and reliability, a magnifying of the move- 

 ment of the barometer cistern. (The present apparatus doubles the move- 

 ment.) (c.) The instrument continues working for a month, and even 

 longer, without interruption. (rf.) The introduction of a new slip is easily 

 accomplished in about one minute, and no new correction is then required, 

 (e.) The second fixed pencil marks along the margin of the paper slip a line, 

 which by being broken every three hours marks the time. This line serves 

 also for adjusting, for the subsequent measuring of the curve and trans- 

 parent scale, with the co-ordinate lines of time and height. 



IV. Finally, the mechanical execution of the apparatus, which comes from 

 the establishment of Herr Wanke, is deserving of attention. 



2874. Electric Registering Anemometer with momentary 

 contact contrivance. 



Professor O snag hi, Imperial Meteorological Central In- 

 stitute, Vienna. 



The apparatus registers each kilometre by marks impressed on a slip of paper 

 moved by clockwork. 



2875. Wind-Current Autograph, or Registering Appa- 

 ratus. John G. Schoen. 



This " Wind-Current Autograph " marks, or registers, continuously and 

 correctly, on a strip of paper moved by clockwork, the motion or direction of 

 the currents of wind in such a manner that the time is indicated as the 

 abscissa, and the angle of elongation of the weather-vane towards the north 

 shown at every particular moment, as the ordinate. 



2876. Electrical self-recording Anemometer and 

 Printing Apparatus, invented by the Exhibitor. 



J. E. H. Gordon, B.A., Cambridge. 



The figures on the left hand side of the paper give the hours, those on the 

 right the direction of the wind at each quarter of an hour, while for every 

 mile of wind that passes over the cups on the roof a dot is made in the 

 centre of the paper. The number of dots between any two consecutive 

 figures is the velocity in miles per hour for that hour. The communication 

 with the roof being made by electricity no shift is required. 



2877. Automatic Light Registering Apparatus. 



A. Salted paper. D. Drying reel. 



B. Silver nitrate solution. E. Dark box. 



C. Trough for silvering paper. F. Insolator. 



