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An adding machine is the device, which performs the arithmetical operation of addition and subtraction. An adding machine is a type of calculator, usually specialized for bookkeeping calculations. In the many countries, very old adding machines were usually built to read in dollars and cents. They required the user to pull a crank to add numbers.

It features support for multi-column printing of tape at user-selectable font sizes, support for text-to-speech engine for reading back of tape contents, spreadsheet and word processor program integration via Windows clipboard, user-definable macros to automate repetitive tasks, separate memory LED, mouse over status bar quick help.

·To add: Just click on the keys and the values will be added automatically to the display window.

·To reset: Click on the reset lever (on the right), to zero the display.

·Row values The bottom row equals 1, the next 2... The top row equals 9.

·Column values increase ten fold from right to left. <--
The right most columns are for cents, the next column is for dimes, dollars, tens of dollars, and so on...

·This machine was used mainly for addition, but is capable of subtraction, multiplication and division.

Adding Machine Information

·Dial, Slide and Chain Adders: These fairly simply devices were made for adding and subtracting. The dial and chain models shown had automatic tens carry. The slide adders, however, required help from the user to carry. The user had to notice that a carry was needed, and pull the stylus back in the other direction and around a hook shape in order to advance the next slide one position. Thus, the slide devices were really adding aids, rather than true adding machines and were very simple in construction.

·Printing Models: Simple adding machines that printed on a paper tape were introduced earlier. But some later models replaced the cranks with electric motors. The number was entered on the keyboard and the crank on the right was pulled to print the number on the tape and add the number to the running total. When the user needed the running subtotal, the Subtotal key was held while the arm was cranked. The Total key was held to produce a final sum which also cleared the machine.

·Direct Adders (Comptometer & Burroughs): This mechanical adder was introduced in 18th century. There were a set of digit keys 1-9 for each position (zeros did not entered) and a lever to clear the result. Numbers were added as each digit key was pressed leaving no room for error. Results were accumulated in the 11 windows below the keyboard. Unlike the slide adders above, this machine did fully automatic carries. For example if 99999999 was displayed and the 1 key was pressed, in well under a second the machine displayed 100000000. The machine suppressed leading zeroes. On each digit wheel, the zero was actually a window into an inner wheel. A shutter wheel could rotate to cover the zero below. Subtraction on the Comptometer was via complementary digits. These digits were printed smaller than the additive digits on each key.

As with most adding machines, subtraction via complementary digits was a little tricky. The user needed to mentally subtract one from the number to be added and since there were no complementary 9 digits, 9s were simply skipped. Also, an extra 1 appeared to the left of the real answer, which could be ignored or shifted further to the left by pressing 9 keys.

Adding Machines for Kids: Two adding machines designed for kids are displayed below. To clear your machine, make sure there are no nines or zeros showing in the answer windows. Pull Total bar toward you firmly and look at the answer windows. If there are nines and/or zeros visible, place index finger from right to left in top holes of the columns where the nines and zeros appear. Depress to any other number. Now place finger on clear bar and depress it as far as it will go. While clear bar is depressed, start from right to left and place index finger in top hole of each column and pull toward you to a natural stop.

In the final scene of The Adding Machine, Zero is told he is to be sent back to Earth to do it all again and has some stark truths about his situation pointed out to him. The sad truth is that many today, which are aware, having abandoned the project to change things, would envy Zeros memory loss and strive towards his innocence as an ideal.

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