Multiply
To multiply with Antikythera FlyReb, use the unit reference point (digit 10 in red on the internal fixed scale). Choose the multiplier (number by which another is multiplied) on the movable disc and place it at the reference point of the fixed internal scale. Read the result on the movable disk, corresponding to the multiplying (number that is multiplied by another) of the external fixed scale.

Example:
To multiply 7 x 12, place the digit 12 (multiplier) of the movable disk at the red "10" reference point on the internal hard disk.

In correspondence to the digit 7 (multiplying) of the internal hard disk, on the mobile disk it will read: 84. Aeronautical calculator | Antikythera Watches

To divide
To split with Antikythera FlyReb, use the same unit reference point.

Place the dividend (quantity that must be divided by another number) chosen on the movable disk in correspondence with the divisor (number by which another is divided) chosen on the internal hard disk. At the reference point (digit 10 on the hard disk

internal), read the response on the mobile disk.

Example:
To divide 120 by 4, place the digit 12 of the movable disk at the
digit 4, of the internal hard disk. Read the answer, that is, 30, on the movable disk, at the unit reference point (digit 10 in red on the internal fixed scale). Aeronautical calculator | Antikythera Watches

Exchange rates
The slide rule is not only useful in aviation, but allows for example to obtain a complete conversion table between two coins.

Example:
To convert sums expressed in € into US $ at the rate of 1 US $ = 1.10 € just align the figure 11 (= 1.10) with the "10" of the internal scale. The internal scale indicates amounts expressed in US $, while the external scale shows their equivalent in €: US $ 40 = 44 €

Hourly speed
Mobile and fixed disks are used to solve hourly speed problems. Two of the following data are known: time, distance, hourly speed.

Example:
They are known: the distance and the hourly speed. Unknown: time. A pilot wants to know the time it takes to travel 486 miles (or km) at an hourly speed of 156 miles (or km).

Solution:

Position the figure 156 of the external movable disk in correspondence with the hour reference point (MPH = Knots) of the fixed scale. Read, on the external scale in correspondence with digit 486 of the movable disk: In the internal hard disk it will correspond to “187”.