It was found that human pilots in turbulent combat conditions simply could not hold course steady enough for a successful bombing run. Norden tried to develop a system, designated SBAE (Stabilized Bombing Approach Equipment) as designated by the Navy, or AFCE (Automatic Flight Control Equipment) as designated by the Army. However, they were deemed inadequate and the government had Honeywell develop the C-1 Autopilot. This used the vertical gyro in the Stabilizer and a separate horizontal gyro located further back in the plane. Servos controlled the rudder, elevator, and ailerons.
AUTOMATIC BOMBING COMPUTER
This was also known as the Low Altitude Bombing Attachment, and was developed to assist the bombardier in quickly making calculations to correct for drift and crosswind. He could set the computer up prior to turning on to the final bomb run, and then once turned, the drift angle and tangent of the dropping angle were automatically displayed. On the left side of the computer, you can see a pair of scales with values for the dropping angle. The tangent scales are relatively easy to locate, but the actual Automatic Bombing Computer is scarce. Here is a video on how to use the ABC:
PRESET DROPPING ANGLE SCALES
These were designed to be used with the E6B flight computer to allow the bombardier to compute the tangent of the dropping angle quickly.
Here is a video on how to use the Preset Dropping Angle Scales:
This was a device that could release the bombs at timed intervals. There were two of these commonly used, the B-2A made by Seeburg which used vacuum tubes and the B-3 made by Mallory which used relays. Here is a video on the use of the intervalometer:
These are the usual items carried in the E-1 Bombardier's case. Prominent among them are several flight computers, including the E-6B, C-2 Density Altitude Computer, the J-1 Time of Run Sighting Angle Computer, and the G-1 True Airspeed Computer. Also important were the Bombing Tables and the Bombardier's A-8 Stopwatch.
JAEGER OR TOTCO DISK SPEED INDICATOR
These were used to assess the rate end mirror drive motor speed and insure that it was correct.