The S&N Adder made in Germany from about 1910

The S&N Adder made in Germany from about 1910.

 

·        Sterling currency version of the S & N chain adding machine.·       S & N was manufactured by Seidel and Naumann of Dresden, Germany. ·       Designed for addition, this model has 9 chains.·       78 x 222 x 57 mm (3.1" x 8.75" x 2.25").·       The S&N Adder is a chain adder which was made in Germany from about 1910 until the early 1920s.·        The Adder has serial number 13175·       The chain links presented to the user have flattened tops marked with the numbers to be added. ·       The special stylus is inserted in the slot in the chain just below the digit required to be added and moved downwards to the horizontal bar. During this movement the numbers are added to the total shown in the window towards the top of the machine.·       The chains latch in the position moved to and it is possible to check the number that has been added. Pressing the lever at lower right allows the chains to spring back to their zero positions, ready for adding the next number.·       The total can be cleared by pulling the lever at top right, forwards as far as it will go and then releasing it.

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