Purpose built mechanical calculation machine for determining the drift of aircraft when operating in crosswind conditions. This device has an eyepiece and a prismatic periscope for viewing a distant feature being tracked. This device has calibrated rotary scales for height, speed (in KNOTS and MPH), and an adjustment to preset the 'crab angle' of the aircaft for cross wind compensation. The device can be opened for cleaning or maintenance purposes. Refer to the following extracts for information about bomb drift: "Crosswinds brought into the bombing problem a new factor, "drift" In order to fly a given ground track in a crosswind, an aircraft had to "crab" into the wind; the angle formed between the aircraft's true heading and its ground track was called the "drift angle" In a crosswind, the bomb would impact directly behind the aircraft and along its longitudinal axis at the moment of release. But this meant that the bomb would strike the ground at some point downwind of the aircraft's ground track. Thus, in order to score a hit, the bomber had to fly a ground track that ran upwind of the target." "Air resistance acting on a bomb after release caused it to lag behind the drop point and hit somewhere behind the bomber. The distance from a point beneath the aircraft at the instant of bomb impact to the point of bomb impact was called "trail." Trail increased as the bomber's airspeed increased or as its altitude increased. Furthermore, since different bombs encountered different resistance in the air, trail was also a factor of bomb shape."A. M. Drift Recorder MKII REF. No 6B/190 No 2668/41 X/ 3606 3E4H28

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - number 32House numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - number 51House numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - number 69House numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - number 77House numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - number 83House numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - 7 EvansHouse numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - number 30House numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - number 32House numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - number 41House numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - - number 66House numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - number 79House numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - Bridge StreetHouse numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - number 85House numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - number 90House numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - number 96House numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - number 118House numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - number 169House numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith TURNBULL photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith TURNBULL in December 1996 - Albion HotelHouse numbers noted on backbuilt environment - commercial, business and traders - hotels, meredith turnbull, albion hotel

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - number 25 EvansHouse numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - number 54, 56House numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - number 59, 60House numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - Graham Street overpassHouse numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - 8 and 9 EvansHouse numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - number 13, 14House numbers noted on backbuilt environment - domestic, meredith turnbull

Meredith Turnbull photographed this series in 1996 to record the rapidly changing streetscape, which had already had a number of old houses replaced by concrete two-storey structures under the State government's urban consolidation policyFrom a series of 70 colour photos recording all buildings in Evans Street from Graham Street overpass to Ingles Street, as photographed from the railway reservation, by Meredith Turnbull in December 1996 - number 15, 17House numbers noted on backbuilt environment - domestic, meredith turnbull