![]() Body-Upper Side Showing Cursor Indicator on 10 inch scale ![]() Front ![]() Well ![]() Body-Lower Side showing cm scale ![]() Back ![]() Slider Back |
Details |
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![]() Cursor Indicator at Top | |
![]() Front Left |
![]() Front Right |
![]() Well Left |
![]() Well Right |
![]() Bottom-Side Left |
![]() Bottom-Side Right |
![]() Back Left |
![]() Back Right |
![]() Slider Back Left |
![]() Slider Back Right |
Note This rule was invented by Prof. Perry and is called "System Perry." It has a pair of LogLog scales which refer A/B scales so that they cover modern equivalent of LL2 and LL3 (and their reciprocal scales) with a pair of scales. One mystery about this rule is that the cursor has a pointer to the ten inch scale on the upper side of the body. The rest of the scales being 25 centimeters long , what could be the possible use of this indicator?. |