download the leaflets: 251-2E Bimetallic Actinograph, Robitzsch-Fuess No. 58dc
251-0E Robitzsch Type Radiation Recorder - Aktinograph No. 58c
                                121-0E Meteorological Thermometers (No. 58a)

No. 58dc Bimetallic Actinograph, Robitzsch-Fuess Type
                58dc - Bimetallic Actinograph, Robitzsch-Fuess type

in grey lacquered hammertone finished, weatherproof casing made of light metal cast, with glass hemisphere,
built-in bimetallic measuring system with recording device for the recording of the radiation intensity as a sum of the sun- and sky-radiation, with vibrator and box level.
The refind model no. 58dc with the enlarged recording width measures the global radiation with the highest accuracy because of separated room for clockwork and registration mecanism.

58dc - Bimetallic Actinograph, Robitzsch-Fuess typeMeasuring range:
     0...2 cal/cm²min
     or 0...8.2 J/cm²min

Divisions of chart:
     0.05 cal/cm²min
     or 0.2 J/cm²min

Drum rotation:
     a)  daily      or
     b)  weekly

Recording drum:58dc - Bimetallic Actinograph, Robitzsch-Fuess type
     Ø 93.3 mm
     height: 93 mm
     height of recording: 65 mm
     time of running: app. 9 days
     writing width: 65 mm

Dimensions: 180 x 200 x 400 mm
Weight: 6.2 kg

     1 spare cartridge pen
     1 set of recording charts
        (100 charts for daily rotation or 54 charts for weekly rotation)
     1 bottle of silica gel
     1 small transformer 220/8 VAC

No. 58c Robitzsch Type Radiation Recorder - Actinograph

The Robitzsch Type Radiation Recorder measures the total of direct solar and diffuse celestial radiation reduced to a horizontal plane. The measuring accuracy of about ± 5 % is sufficient for all fields of application. Attendance of the recorder is easy for untrained persons, too.
58c - radiation recorder
The measuring system consists of three symmetrically arranged bimetallic strips, a black one in the middle between two whitened strips. Due to differential absorbtion a temperature difference is created between the strips which serves as a measure of radiation intensity. The position of the recording pen depends only on the temperature difference of the strips and is not influenced by the actual temperature level.

The sensitivity range comprises the entire spectrum of solar an celestrial radiation; only the longwave range > 2 μ is not included, this, however, contributes only very little to the total energy. The total radiation during measuring time in cal-2 is obtained by integrating the radiation curve. The radiation recorder in its present form has been considarably improved as compared with former models. These improvements are:

a) Greater measuring accuracy and independence of disturbing effects by the elimination of scattered radiation
   (Protective cap after Götz and Casparis).
b) Direct recording of radiation intensity in cal cm-2 min-1.
c) Device for conveniently applying time marks.
d) Set-to-zero without affecting the adjustment of the instrument.
e) Reduction of bearing friction by build in virbator.

Measuring range: 0 ... 2.0 cal/cm²/min
Diagram divisioned in: 0.1 cal/cm²/min 

   Ø 93,3 mm 
   93 mm height
   writing width: 50 mm
   time of running: app. 9 days
   time of drum rotation: 1 day / 1 week, (according to choice)

   1 set of recording charts
   1 spare fibre-pen
   1 bottle of silica gel
      (100 charts for daily rotation or 54 charts for weekly rotation)

58a - Radiation-Intensity Meter, Robitzsch typeNo. 58a Radiation-Intensity Meter, Robitzsch type

consisting of a black and a white bulb thermometer, 
with calibration sheet
range: -5 ... +100 °C with 1/2°C divisions
weight: 0.6 kg

No. 58b
Stand with bracket for No. 58a

Dr. Alfred Müller - Meteorologische Instrumente KG
Chausseestraße 39 / 42c, D-15712 Königs Wusterhausen
Telefon: +49 (0)3375 9025-32 Telefax.: +49 (0)3375 9025-36
e-Mail: dr.a.mueller-r.fuess@t-online.de