Radio Observatorio de Jicamarca - Instituto Geofísico del Perú

vertical-intensity (Z) variometers and one photographic recorder made by Otto Toepfer andSon, Potsdam. Because of the frequent and large fluctuations in H and loss of trace duringtimes of magnetic disturbance, a La Cour low-sensitivity H variometer was installed as anadjunct to the Eschenhagen equipment in April, 1937. It was mounted on a speciallyconstructed bass support on the north edge of the variometer pier of the Eschenhagenapparatus, adjacent to the H variometer, the position of which is noted in figure 2 (D).Control-time is with an electronic clock made by Oscar Veliz, Peru. From 1922 to 1997 wasused as the principal magnetograph and from 1998 to 2009 was used as backup variometer.On January 01, 2010 at 00:00:00 hours UT, this instrument was stopped after to work for 88years, for to be modernized its photographic record system.Eschenhagen DTM CIW No. 2(A) Horizontal - Intensity variometer (H)(B) Declination variometer (D)Pushkov(C) Vertical - Intensity variometer (Z)La Cour(D) Low – sensitivity variometer (H)Recorder(E) Photographic recorder Toepfer&SonFigure 5 Magnetograph VariometerFigure 6 Last Eschenhagen DTM CIW No. 2 Magnetogram, December 31, 2009.From October 2009 to July 2010, an opto-electronic system registry prototype wastested in the geomagnetic laboratory room for to work with Eschenhagen DTM CIW No. 2variometer.Apartado 130207, Lima 13, PerúTeléfonos (+51-1)317-2313 - Fax (+51-1)317-2312