drift sight

One is an adaptation of the method used with the Drift Sight.

His "Drift Sight" included a simple system for calculating the effects of wind.

However, the Drift Sight was still useful only for bomb runs along the wind line.

The most important invention of his career was the Gatty drift sight.

In 1916 he introduced the Drift Sight, which added a simple system for directly measuring the wind speed.

Hundreds were in use by 1918, and had supplanted the Drift Sight by the war's end.

In this respect the Drift Sight was similar to earlier bombsight designs.

Great archers, says Strickland, have the paradoxical ability to welcome such pressure and draw strength from a drifting sight.

There were instructions on how to use the Drift Sight for cross-wind bombing, but this was complex and apparently rarely used.

The Drift Sight was mounted to the side of the aircraft using two brackets at the front and back of the sights.

As the Drift Sight only worked correctly if flying straight and level, the bombsight also includes two spirit levels.

This version was the Drift Sight Mk.

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.

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.

Prior to the introduction of the Drift Sight, bombsights were generally very simple systems of very limited accuracy.

Between transmissions he peered through his drift sight at the slowly moving waves below, did little sums upon the slide rule, plotted their position on the map.

A drift meter, also drift indicator and drift sight, is an optical device used to improve dead reckoning for aircraft navigation.

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.

Like the Drift sight, simply taking a measure of the wind using the site itself provided all of the unknown variables needed to complete calculate the bombing approach.

The original design was only suitable for low-level use and was later known as the Low Height Drift Sight Mk.

The O/400s could carry a new 1,650 lb (750 kg) bomb which were aimed with the Drift Sight Mk 1A bombsight.

Oddly, when development of new bombsights started in the 1920s, these were based on the Drift Sight design, not the CSBS.

This mounting system was common among early British bombsights, notably the Equal Distance Sight that led to the Drift Sight.

The CSBS was only slightly more complex than the Drift Sight to build, adding a compass and another adjustment to the sights to account for cross-drift.

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.