There were instructions on how to use the Drift Sight for cross-wind bombing, but this was complex and apparently rarely used.
12.
The original design was only suitable for low-level use and was later known as the "'Low Height Drift Sight Mk.
13.
The "'Drift Sight "'was a bombsight developed by Harry Wimperis in 1916 for the Royal Naval Air Service ( RNAS ).
14.
Although the Drift Sight was a significant improvement over earlier designs, it still required the aircraft to fly up or downwind on the final bomb run.
15.
The result was his Drift Sight, which used a small bar that was aligned with the motion of objects on the ground to measure the wind.
16.
The Drift Sight eliminated the need for a stopwatch to perform this calculation, as on earlier devices, and greatly eased the bomb aimer's workload.
17.
Like the Drift sight, simply taking a measure of the wind using the sight itself provided all of the unknown variables needed to complete calculate the bombing approach.
18.
Oddly, when development of new bombsights started in the 1920s, these were based on the Drift Sight design, not the CSBS . and it was a borrowed Mk.
19.
In the Equal Distance design, this movement was itself the main aiming mechanism, and could not be adjusted for ease of use as it was in the Drift Sight.
20.
A major difference between the Drift Sight and CSBS was that the later needed to sight below the aircraft, and was not as suitable for use on the side of the fuselage.
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