JUAL: Spiegel Relaskop

Slope Correction Device gives topographic correction when using two chain tape with trailer. Used by foresters since 1954, the Relaskop combines six instruments into one. Saves time and money when cruising timber, variable plotting or Three P sampling. Each unit weighs only 14 oz.; furnished complete with leather case and instructions.

American Scale reads In English units ( sq. ft./ acre, inches, feet) for BAF 5, 10, 20 and 40. Also includes a 66' slope correction scale. Ideal for use on trees smaller than 96" dbh

SPECIFICATION
General instruction for use of the Relaskop for measuring diameter:

• Measure the desired horizontal distance ( H metres) from the base of the tree ( or point directly beneath the desired tree site) to a location where the required point ( eg change in diameter) can be seen. Note that you must be at least 5 m away for every 20 cm anticipated diameter.
• Sight at the required point, while holding the break button to allow the scales to freely rotate.
• Read from the diameter scale once the scale has settled the number of large bands ( with the number 1 printed on them) ( L) ; the number of small bands ( 4 narrow bands immediately to the right of the large 1 band) ( S) ; and an estimate of any fractional small band ( s) . Estimate the fractions of the small band as 0.2 ( just into the band) , 0.4 ( almost half) , 0.6 ( just over half) , 0.8 ( amost full narrow band)
• Diameter is calculated as d ( cm) = H* ( L+ 0.25* ( S+ s) ) * 2
• Check to ensure the diameter appears correct. Note that L will be 0 or 1, S will be 0, 1, 2, 3, 4 and s will be a fraction less than 1.0.

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