Actinografo antigo


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Actinografo antigo

  1. 1. DR. ALFRED MÜLLER METEOROLOGISCHE INSTRUMENTE KG R. FUESS 251,2 EBimetallic Actinograph, Robitzsch-Fuess Type 58dcThis bimetallic actinograph is a further development of model 58c, which has proven itself for yearsin meteorology and climatology. Like the former, the new design records the varying intensity ofglobal radiation; i. e., the radiation received from sun and sky, on a horizontal surface. Operation ofthe instrument is as easy as that of a simple thermograph so that it can even be operated byinexperienced persons.The measuring system consists of a bimetallic strip which has a double slit. The two outer strips ofthe thusly created 3 strips are coloured white, while the inner one, which is connected to the writingsystem, is black. All strips are interconnected with each other and with recording system, in a waycompensating the influence of temperature and insuring the position of the pen is solely determinedby the energy of radiation.The measuring system is protected against the influence of the weather and of the motion of the airby an optically ground and polished glass hemisphere. In order to avoid condensation of humidityinside of the hemisphere and to keep the whole instrument dry, a small removable cup filled with"Silicagel" has been installed in each one of the two parts of the casing.251-2e 1 Dez-09
  2. 2. DR. ALFRED MÜLLER METEOROLOGISCHE INSTRUMENTE KG R. FUESSThe range of sensibility comprises the whole spectrum of radiation from sun and sky, withexception of the regions absorbed by the glass hemisphere; i. e., the ultraviolet and the infraredabove appr. 2m, regions that hardly contribute to the total of energy.In accordance with an idea of Götz and Casparis the bimetallic strips exposed to radiation have beenarranged within the corresponding sector of a whitened protecting cap guarding their backsideagainst diffuse radiation. This results in a diminition of seasonal influence, as well as of theinfluence of the azimuth of the sun on the coefficient of calibration and thus facilitates evaluation.Since the bimetallic system has been improved as compared to model 58c, the power of thebimetallic system and the accuracy of measurement have been raised in spite of an increased penamplitude from 50 to 65 mm.A further and quite remarkable improvement is the new shape of the casing. With model 58c, thewhole casing had to be taken off for a change of charts. In the new instrument, however, the drumhas been installed in the lower, cubic part of the casing, while the bimetallic strips are arranged atthe top of its upper, cylindrical part. The two parts of the casing are separated from one another bya horizontal wall, which offers the following essential advantages:In order to change charts, one simply opens the two doors in the lower part. Thus, the bimetallicstrips will not be damaged by falling rain drops, as they always remain protected by the glasshemisphere.Disturbances of the thermic equilibrium of the instrument caused by manipulation during operationhave been greatly diminuated.Thanks to the almost rotation-symmetrical shape of the casing, thermic balance is less influencedby the variations of the azimuth of the sun and the direction of the wind, which favourablycontributes to increase the accuracy of measurement.By actuating a rotary knob in the wall of the casing, it is possible to apply time marks withouthaving to open the instrument.If necessary, the zero-position of the pen can be readjusted by means of an adjustment screw.A small vibrator, which is fed 5 to 8 volts a.c. from a small transformer, effects a hardly noticeablevibration to mounting and mechanism, essentially reducing thereby bearing friction and,consequently, increased accuracy of reading.According to choice, drums are supplied for periods of revolution of 1 or 7 days.The charts are divisioned in in (Charts No. 157k, 152k, 158 k) or in No. 157kj, 152 kj, 158 kj) in such a manner that an immediate read-off is possible. Thedivisions are linear so that the sun totals of radiation in or in respectively(depending of the chart in use) may be obtained in a simple and comfortable manner by means ofplanimetry.For installation of the instrument in stormproof fashion, mounting plate 58e is supplied on demand.After aligning the plate, it is screwed tightly to the given base; e. g., a wall set-off, a platform etc.Then the actinograph is fastened to the plate by means of two lateral knurled screws in such waythat it always remains in the same position; i. e., bimetallic strips in east-westerly direction, glazeddoor towards the north. For an occasional cleaning etc. the instrument can be taken off withoutdifficulty by slightly loosening the two screws.251-2e 2 Dez-09
  3. 3. DR. ALFRED MÜLLER METEOROLOGISCHE INSTRUMENTE KG R. FUESSSpecification No. 58dc Bimetallic Actinograph, Robitzsch-Fuess Type, measuring range : 0 ... 2.0 cal cm-2 min-1 or 0 ... 8,2 diagram division : 0.05 for cal, 0,2 for J recording drum : 93.3 mm diameter, 93 mm height available height for recording: 65 mm drum rotation : 1 or 1 week, according to choice operation period of clock-work movements: appr. 9 days dimensions : 180 x 200 x 400 mm weight : 6.2 kg Accessories free of charge: 1 set of diagrams (cal or J according to choice) 1 bottle of special ink 1 spare pen 1 bottle of silica gel (cont. 100 gr) Supplementary parts SO18 UG105 Mounting plate for installation of the instrument in the measuring place (=No. 58e) dimensions : 220 x 240 x 30 mm weight : 1.0 kg Spare parts 58s 1 glass pen with holder 1095v 1 bottle of special ink Recording drum with clock-work movement (operation period of clockwork movements approximately 9 days): 309w for one rotation in 1 week 309d for one rotation in 1 day SO18 T451 1 glass hemisphere (=No. 58g) SO18 UG95 1 drying cartridge (=Nr. 58t) 58n 1 bottle of silica gel (cont. 100 gr) 1013n 1 filling and cleaning equipment for capillary pens251-2e 3 Dez-09
  4. 4. DR. ALFRED MÜLLER METEOROLOGISCHE INSTRUMENTE KG R. FUESS Diagrams Division in cal cm-2 157k 1 set of diagrams = 54 sheet, 1 rotation = 1 week 152k 1 set of diagrams = 100 sheet, 1 rotation = 4 days 158k 1 set of diagrams = 100 sheet, 1 rotation = 1 day Division in J cm-2 157kj 1 set of diagrams = 54 sheet, 1 rotation = 1 week 152kj 1 set of diagrams = 100 sheet, 1 rotation = 4 days 158kj 1 set of diagrams = 100 sheet, 1 rotation = 1 day DR. ALFRED MÜLLER Tel.: +49 3375 9025-32 METEOROLOGISCHE INSTRUMENTE KG Fax: +49 3375 9025-36 Chausseestraße 39 / 42c e-mail: D-15712 Königs Wusterhausen www.rfuess-mueller.de251-2e 4 Dez-09