This page contains an image which is one of several belonging to the photo gallery pages which are part of several pages relating to the invention of the world's first automatic totalizator in 1913 and Automatic Totalisators, the company founded to develop, manufacture and export these systems.

Brough Park Adder - Electro-Mechanical computing on an industrial scale

This is one of the Forecast Pool adders in the Automatic Totalisators factory at Chalmers Street in the Sydney CBD, to be installed at Brough Park in 1936, Newcastle upon Tyne. As with the previous images in the Photo Gallery of the Brough Park machinery, the storage screws, a mechanical form of memory can be seen. There are 10 of them and they connect the adding shafts with their escapement wheels and epicyclic gears at the rear of the adder to the large cogs behind the counters. They sit below the bars that hold the adder mounting plates together. They have the circular cam wheels on them that look like a tea biscuit. These cams operate a contactor, that transfers the rotation of this shaft, which represents investment, to the display equipment. The purpose of the storage screws, is to buffer the rotation of the high acceleration adding shafts with the machinery that is slower to respond due to higher inertia restricted acceleration. More after the image...
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For more detail on the storage screw have a look at the first image in the Brough Park section of the Photo Gallery which can be reached by clicking on this image and scrolling up. Additionally, there is an Engineering Drawing of the storage screw in the first image of the Figures from George Julius' paper presented to the Institution of Engineers Australia in 1920 section of the Photo Gallery which follows the Brough Park section. The ten adding shafts are clearly visible at the back of this adder. They sit beneath the fixed support bars connecting the two end plates, the distant end plates are the back of the adder. There is an Engineering Drawing of the epicyclic gears and escapement wheels on an adding shaft in the second image of the Figures from George Julius' paper presented to the Institution of Engineers Australia in 1920 section of the Photo Gallery. The escapement wheels on the adding shafts can be seen. Below these wheels are solenoids that operate the escapement mechanisms that allow graduated rotation of the escapement wheels. The solenoids are activated by impulses from the Ticket Issuing Machines. There is an Engineering Drawing of an escapement wheel, escapement mechanism and solenoid in the third image of the Figures from George Julius' paper presented to the Institution of Engineers Australia in 1920 section of the Photo Gallery. The angular motion of these wheels represents the transaction values. The fewer the teeth on the escapement wheel the greater the movement with one operation and the higher the value. The epicyclic gear arrangement that connects the escapement wheels along the adding shaft cumulatively adds the rotation of the escapement wheels along the shaft such that when it arrives at the storage screw the rotation is the sum of the rotation of each escapement wheel on the adding shaft. There are 6 escapements and solenoids on these shafts. One of these adder units is visible on the table to the left of this adder. Nine complete adding shafts attached to the storage screws and drive cogs can be seen on the table at the rear of the image, waiting to be installed on an adder table like the one this is sitting on. The cogs attached to the table provide the drive for the adding shafts and storage screws and are driven by a motor that will be installed underneath the adder table.

There is no photographer's stamp on this photograph.