As the earth rotates the position of the spot moves across the card. These sunshine recorders (also known as Campbell-Stokes recorders), measure the number of hours in the day during which the sunshine is … The natural solar radiation is notoriously intermittent and varying in intensity. In 1964 the Campbell-Stokes Sunshine Recorder was adopted by the World Meteorological Organisation (WMO) as their Interim Reference Sunshine Recorder for use in all … The sunshine recorder is used to measure sunlight used in a day. The duration of the bright sunshine at a locale is measured, for example, by a photoelectric sunshine recorder. - Answers The Campbell-Stokes recorder (sometimes called a Stokes sphere) is a kind of sunshine recorder. Instrument: Campbell-Stoke Sunshine Recorder. corresponding to the definition of direct solar irradiance, and the processing unit counts two minutes of sunshine for every four pulses. (2) Solar-cell-type sunshine recorder (Figure 7.4) A solar-cell-type sunshine recorder is an application of the contrast method presented in the CIMO Guide. Campbell-Stokes Pattern Sunshine Recorder employs a glass sphere to focus the sun's rays to an intense spot, which will burn a mark on a curved card mounted concentrically with the sphere. An alternative method of measuring solar radiation, which is less accurate but also less expensive, is using a sunshine recorder. The effect of heat of the sun is used as recording medium. Sunshine Recorder (1603) and (1604) (160x) Sunshine Recorder Operating Instructions Description The Campbell Stokes sunshine recorder is a self-recording instrument for the continuance of sunshine. The person recording the length of sunshine in a single day would simply add up the length of the burn marks to measure the sunshine. What is unit of measurement for sunshine recorder? 7.1.2 Sunshine Duration Measuring Instruments Campbell-Stokes sunshine recorders and Jordan sunshine recorders have long been used as instruments to measure sunshine duration, and are advantageous in that they have no moving parts and require no electric power. Campbell-Stokes sunshine recorder with the actual direct solar irradiance. In this device a glass sphere concentrates sunlight onto a card and the amount of scorching on the card records the amount of sunlight that had fallen on it. Sunshine hours (or, more correctly, hours of bright sunshine) is the traditional measure of the amount of sunshine that a location has received. Element: Sunshine Duration. Sunshine is recorded with a simple, yet clever device, called a Campbell-Stokes recorder, the design of which goes back to 1879. The Campbell-Stokes Sunshine Recorder is manufactured by Fairmount Weather Systems to the specifications of the British Meteorological Office and is used extensively by government meteorological services world wide. Below are checklists of Sunshine recorders and solar-related instruments on postal items (stamps, souvenir sheets, aerogrammes, postal cards, etc.). It was determined by comparing the sunshine duration recorded using a Campbell-Stokes sunshine recorder with the actual direct solar irradiance. Catalog numbers, years of issue, and notes on the items featured are given when available. Instrument Campbell-Stokes sunshine recorder (Figure 1) How it works A spherical glass lens burns a trace in a specially-shaped card in sunshine Pros Long-established (developed in 1870s) Standard method for many years, now being superseded by electronic sensors Cons Burn threshold very variable Measurement of burn length very subjective (± 15%) The most potent radiation that creates the highest potential for concentration and conversion is the bright sunshine, which has a large beam component. If readers know of additional information or images, please contact the authors using the e-mail addresses at the bottom of this page. No drum is necessary as the recording medium itself is moving. It was invented by John Francis Campbell in 1853 and modified in 1879 by Sir George Gabriel Stokes. 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