The K&E 68-1100 “Deci-lon” is another large slide rule with multiple scales on both sides. It was part of a third batch of slide rules I acquired in 2022. The fixed scales are Ln-3/Ln-2/Ln-1/Ln-0/D/DI/K on one side and Sq1/Sq2/DF/D/Ln0/Ln1/Ln2/Ln3 on the other side. The slider scales are CF/CIF/L/CI/C on one side and B/T/SRT/S/C on the other side. This slide rule also came with a case with a previous owner’s name written inside the flap.
Serial number: 049289
Dimensions: 32.4 cm x 4.9 cm x 0.5 cm
![Keuffel & Esser 68-1100 Deci-lon slide rule. Serial number 049289](https://i0.wp.com/v16.imablog.net/wp-content/uploads/2023/01/KE68-1100_01.jpg?resize=525%2C111&ssl=1)
![Keuffel & Esser 68-1100 Deci-lon slide rule. Serial number 049289](https://i0.wp.com/v16.imablog.net/wp-content/uploads/2023/01/KE68-1100_02.jpg?resize=525%2C114&ssl=1)
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