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B-47 C LCUL TOR GMT
3 TIME ZONES

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  • Seite 1 B-47 C LCUL TOR GMT 3 TIME ZONES...

  • Seite 2: Inhaltsverzeichnis

    Inhaltsverzeichnis Content Einstellungen Setting instructions Funktionen der Rechenscheibe Slide-rule functions Bedeutung der Markierungen The significance of markings 10 11 Verhältnisrechnung Relative calculations Division Division Multiplikation Multiplication Geschwindigkeit pro Stunde Speed per hour Distanz Distance Entfernung pro Minute Distance covered in minutes Umrechnungen Conversion 24-36...
  • Seite 3 The B-47 C LCUL TOR GMT 3 TIME ZONES is not just a watch but also an instrument for simple calculations used in the same manner as slide-rules were before elect- ronic calculators became popular. second, separate time- zone is available which can also be used as a 24 hour indicator.
  • Seite 4 N.B.: Quick adjustment (date, 2nd time zone) is not possible between 8 p. m. and 2 a. m.! Do not activate the crown under water. Water-resistant with pushed-in crown only.

  • Seite 5: Setting Instructions

    The crown (4) is used to set the slide-rule. By checking the scale positions, you can calculate simple equations e.g. changing miles to kilometres or sea miles to land miles or perhaps the rate of ascent or descent of an aircraft.
  • Seite 6 chtung: Schnelleinstellung (Datum, 2. Zeitzone) ist nicht möglich zwischen 20.00 und 2.00 Uhr! Krone nicht unter Wasser betätigen. Wasserdicht nur mit angedrückter Krone.
  • Seite 7 Die Krone (4) dient zur Einstellung der Rechenscheibe. Die Gegenüber- stellung der Skalen ermöglicht die Berechnung verschiedener Werte z.B. in der Flugnavigation die Umrechnung von Kilometern, See- oder Landmeilen, oder die Berechnung der Steig- bzw. Sinkflugrate. Weiterhin lassen sich Durchschnittsgeschwindigkeit oder der Spritverbrauch ermitteln. Die nzeigen von ußen nach Innen: Count-down (Lünette 60-0 äußere Skala) Dritte Zeitzone (Lünette 1-24 innere Skala)
  • Seite 8 Slide-rule outer scale djusting ring (white) lthough divided on a scale from 10 to 100 this does not restrict the use to this range but can be understood for all numbers such as 1; 10; 100 or a multiple thereof. The decimal value i.e.
  • Seite 9 Rechenscheibe äußere Skala C Drehring (weiss) Die Skaleneinteilung von 10 bis 100 ist keine Beschränkung auf diesen Zahlenbereich. Es kann mit allen realen Zahlen gerechnet werden. Die Zahl 10 kann auch für 1, 10, 100 oder ein Vielfaches stehen. Der Dezimalwert der Zahl, also die Kommastellung, spielt beim Rechenschieber keine Rolle und wird im Ergebnis erst nachträglich bestimmt.

  • Seite 10: Slide-Rule Functions

    The significance of numbers and special-markings The orange markings facilitate the changing of litres (LTR) into gallons (G L) or miles into kilometres. One sea mile (N UT) is the equivalent of 1.852 km and one English land mile (ST T) 1.6093 km.
  • Seite 11 Die Bedeutung von Zahlen und Sonderzeichen Orangefarbige Einheitszeichen erleichtern die Umrechnung von Liter (LTR) u. Gallonen (G L) oder Meilen u. Kilometern. 1 Seemeile ( N UT) entspricht 1,852 km und 1 englische Landmeile ( ST T) = 1,6093 km. Die Dreiecke auf beiden Skalen sind Bezugsmarkierungen für die nachfolgend beschriebenen Rechenoperationen.

  • Seite 12: The Significance Of Markings

    Read/Ablesen 10 : 15 = 24 : x x = 36 Set/Einstellen...

  • Seite 13: Relative Calculations

    Relative calculation – Proportions The size of a picture should be increased proportionately. Example: photo is 10 cm wide and 15 cm high. copy is required with a width of 24 cm. How high will the picture be? The width 10 is aligned with the height 15 and a relationship thus established between the two.
  • Seite 14 Set/Einstellen Read Ablesen 21 : 7 = x x = 3...

  • Seite 15: Division

    Division Dividend ÷ Divisor = Result The procedure is simple: The dividend (the sum to be divided) on the outer scale is always positioned opposite the divisor (the dividing figure) on the inner scale . The result can then be found on the outer scale opposite the orange 10 of the black scale...
  • Seite 16 Einstellen 15 x 11 = x x = 165 Read/Ablesen...

  • Seite 17: Multiplication

    Multiplication Multiplicand x Multiplicator = Result The multiplicator (the multiplying factor) on the outer scale always positioned opposite the orange 10 on the inner scale The result is found on the outer scale opposite the multiplicand (the figure to be multiplied) on scale Position the figure 11 on (outer scale) against the orange 10 on the inner scale...
  • Seite 18 Read/Ablesen Set/Einstellen x = 213...

  • Seite 19: Speed Per Hour

    Speed per hour If the factors distance and available time are known, then the necessary average speed to travel the distance can be calculated. Example: The distance of 160 kilometres or miles is travelled in 45 minutes. What is the average speed per hour? Position 16 (for 160) on the outer scale across from 45 on the inner scale...
  • Seite 20 Set/Einstellen x = 70 Read/Ablesen...

  • Seite 21: Distance

    Distance If the time travelled and average speed per hour is known, then it is possible to calculate the distance travelled. Example: What distance (x) will be travelled in 21 minutes if the average speed is 200 km per hour? Position 20 (representing 200 km/h) on the outer scale opposite the orange arrow for speed MPH on scale The result is found on the outer scale...
  • Seite 22 Set/Einstellen Read Ablesen x = 3.33...

  • Seite 23: Distance Covered In Minutes

    Distance covered in minutes If the average speed per hour in kilometres or miles is known, then it is possible to calculate the average speed per minute expressed as kilometres or miles per minute travelled. Example: What distance (x) will be travelled in a minute if the average speed is 200 km or miles per hour? Positioning 20 on the outer scale representing the...
  • Seite 24 Read/Ablesen Einstellen 100 ST T = x km x = 161...

  • Seite 25: Conversion

    Conversion Using the arrows on the inner scale at 33 N UT; 38 ST T and 60 MPH you can read-off nautical miles i.e. sea miles, English miles i.e. statuary miles and kilometres in other units. Miles ST T in kilometres Example: What are 100 miles in kilometres? The orange 10 (representing 100 miles) on the outer scale...
  • Seite 26 Einstellen Read 80 ST T = x N UT Ablesen x = 69.5...

  • Seite 27: Miles In Sea Miles

    Miles ST T in sea miles N UT Example: What are 80 English miles ST T converted to sea miles N UT? Position 80 on scale opposite the orange marked ST T on the inner scale The result in nautical sea miles, 69.5, can be read on scale opposite the orange unit N UT on scale Meilen ST T in Seemeilen N UT...
  • Seite 28 Set/Einstellen Read Ablesen 80 km = x miles/ eilen x = 50...

  • Seite 29: Kilometres In Miles

    Kilometres in Miles Example: What are 80 kilometres in Miles? Position 80 on the outer scale opposite the orange triangle KM on the inner scale The result can be read on the outer scale opposite the orange arrow ST T for speed from scale 80 kilometres convert to 50 miles.
  • Seite 30 Set/Einstellen Read Ablesen 20 minutes = x seconds inuten = x Sekunden x = 1200...

  • Seite 31: Minutes In Seconds

    Minutes in seconds With the assistance of the orange triangle on the inner scale at 36 you can read-off the amount in minutes as seconds. This arrow marks the seconds. Example: How many seconds (x) are in 20 minutes if one hour has 3600 seconds? The figure 20 (for twenty minutes) on the outer scale has to be positioned opposite the orange triangle MPH...
  • Seite 32 Read /Ablesen Einstellen 22 I.G L = x LTR x = 100...

  • Seite 33: Imp. Gallons In Litres

    Using the arrows on the scales at 10.7 I.G L; 12.9 US G L and 48.5 LTR you can read-off imperial (british) gallons, US gallons and litres in other units. Imperial gallons in litres Example: What are 22 imperial gallons I.G L converted to litres LTR? Position 22 on scale opposite the orange marked...
  • Seite 34 Set/Einstellen 11 LTR = x US G L x = 2.9 Read blesen...

  • Seite 35: Litre In Us Gallons

    Litres in US Gallons Example: What are 11 litres in US gallons? Position 11 on scale opposite the orange marked LTR on the inner scale The result in US gallons, 2.9, can be read on scale opposite the orange unit US G L on scale Liter in US Gallonen Beispiel: 11 Liter entsprechen welchem Wert in US Gallonen? Der Wert 11 der äußeren Skala...
  • Seite 36 Read Ablesen 12 US G L = x I.G L x = 9.99 Set/Einstellen...

  • Seite 37: Us Gallons In Imp. Gallons

    US gallons in imperial gallons Example: What are 12 US gallons in imperial gallons I.G L? Position 12 on scale opposite the orange marked US G L on the inner scale The result in imperial gallons, 9.99 can be read on scale opposite the orange unit I.G L on scale US Gallonen in imperialen Gallonen...
  • Seite 38 Set/Einstellen x = 70 Read/Ablesen...

  • Seite 39: Fuel Consumption

    Fuel consumption Two figures, namely time flown and fuel consumption per hour, are required to calculate fuel consumption for the journey. Example: How much fuel (x) is required to fly for 3.5 hours if you use 20 litres of fuel per hour? Position the number 20 on the outer scale opposite the orange hour-marker MPH on the inner scale...
  • Seite 40 Einstellen 3700 x = 14.8 Read/Ablesen...

  • Seite 41: Height Calculations

    Height calculations Height gain or loss To calculate how long it takes to reach a certain flight height you need to know the height you wish to achieve and the average rate of ascent per minute in metres or feet. Example: n aircraft is to reach 3700 metres and is ascending at the average rate of 250 metres/minute.
  • Seite 42 Set/Einstellen (240 + 40) 14.8 x = 69 Read/Ablesen...

  • Seite 43: Distances During Ascent / Descent

    Distances during ascent or descent Having reached his designated height, a pilot wants to know how far he has travelled. This he can calculate if he knows his average speed of ascent and the time needed for the ascent. nother factor to be taken into account is the possible tail-wind or head-wind.
  • Seite 44 Sun/Sonne North/Norden...

  • Seite 45: Using The Calculator As A Compass

    Using the calculator as a compass Providing the sun can be observed, a watch with two time zones can be particularly useful as a compass. The 24 hour- hand must be synchronised with the hour-hand. By pointing the hour-hand at the sun the 24 hour-hand points to the North.
  • Seite 46 Read/Ablesen Einstellen x = 3.14 x 16 x = 50.2...

  • Seite 47: Geometric Calculations Using

    Geometric calculations using Pi ( ) (3.14159) is used in geometry for calculating area or circumferences of a circle. Circumference: x Diameter (d), Diameter: 2 x radius (r) Example: You want to construct a circular pond with a diameter of 16 metres and need to calculate the length of material needed for the circumference.
  • Seite 48 Please refer to the afore-mentioned slide rule operations for the individual calculations. spect ratio / Flügelstreckung Die einzelnen Rechenoperationen bitte wie zuvor beschrieben ausführen.

  • Seite 49: Spect Ratio

    In viation to calculate the air drag coefficient Example: tailplane wing, profile N C 0006, has a quadratical shape. Depth = 0.9 m and wingspan = 3.6 m How great is the induced drag when the aircraft has a lift coefficient of C = 0.5 and as per the information sheet the Oswald factor is = 0.86?

  • Seite 51: Drawing Of Watch Base Scale

    © FORTIS Uhren G, CH-Grenchen...
  • Seite 52 Official supplier to aviation and space The world’s first manufacturer of automatic wristwatches SWISS W TCHES SINCE 1912 www.fortis-watches.com...

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