The Forster Notebook II

tilter original: "strambaza", a term Leonardo used to describe a tilting or shaking mechanism, likely for hydraulic or mechanical purposes

The following ink notations appear at the top right. Leonardo wrote these numbers in mirror script.
KK 632 / 23
138 Written as mirror-image digits 8 3 1

Several drawings and marks in red chalk, also known as sanguine, occupy the center and lower half of the page.

A red chalk study of a horizontal scale with regular marks. Leonardo likely used this for measuring proportions in engineering or architecture.

A sketch in red chalk showing a curved shape. This resembles the hull of a boat or a structural support frame.

Faint red chalk sketches at the bottom of the page. These appear to be either human anatomical forms or mechanical joints, accompanied by calculations written in mirror script.
555
022

Ink notations including the letters 'KK' and mathematical calculations. Leonardo wrote the numbers in mirror script.