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Replica of the Difference Engine in the Science Museum, reconstructed after studies of Charles Babbage's original drawings by Allan Bromley.
Replica of the Difference Engine in the Science Museum, reconstructed after studies of Charles Babbage's original drawings by Allan Bromley.
Antikythera mechanism built by Allan Bromley and Frank Percival.
Antikythera mechanism built by Allan Bromley and Frank Percival.
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The London Science Museum's difference engine, the first one actually built from Babbage's design. The design has the same precision on all columns, b
The London Science Museum's difference engine, the first one actually built from Babbage's design. The design has the same precision on all columns, but in calculating polynomials, the precision on the higher-order columns could be lower.
Close-up of the London Science Museum's difference engine showing some of the number wheels and the sector gears between columns. The sector gears on
Close-up of the London Science Museum's difference engine showing some of the number wheels and the sector gears between columns. The sector gears on the left show the double-high teeth very clearly. The sector gears on the middle-right are facing the back side of the engine, but the single-high teeth are clearly visible. Notice how the wheels are mirrored, with counting up from left-to-right, or counting down from left-to-right. Also notice the metal tab between "6" and "7". That tab trips the carry lever in the back when "9" passes to "0" in the front during the add steps (Step 1 and Step 3).
Fully operational difference engine at the Computer History Museum in Mountain View, California
Fully operational difference engine at the Computer History Museum in Mountain View, California