|
|
The ‘UNIQUE’ Company was established in England in 1920. This 10 inch early rule is made of mahogany wood with plastic coated paper. The rule is made of mahogany wood with plastic coated paper with 6 scales: A, B, C and D, Log-Log and Reciprocal. The cursor is made of plastic with steel top and bottom and a single hairline. This type of cursor was used only on the early Unique models. On the backside, a table lists values for sine, cos, tan and cot for 1 – 90 degrees. In addition, 22 trigonometrical formulas are printed. Some yellowing has occurred, otherwise in good condition. |
|
