A drill for boring crystal, with screw and balance studies
Notes of a crystal-drilling tool and a building in grey pencil; screws and small balances on the sheet
Two short notes record a drill (trapano) for boring crystal and, in grey pencil, the structure of a building. The sheet itself carries mechanical studies: three long diagonal screw mechanisms, each ending in a roller that reduces friction as it turns, and at the right several small triangular balance figures marked a, b, c and d comparing how freely different suspensions move. Further mirror-script notes present on the sheet are not transcribed here.
On this page
A drill for boring crystal
A brief note labels a drill (trapano) intended for boring crystal.
A building drawn in grey pencil
A second note records the structure of a building sketched in grey pencil; no further text accompanies it in the transcription.
Screw mechanisms fitted with anti-friction rollers
Three long screw mechanisms run diagonally across the sheet, each terminating in a roller wheel that reduces friction as the screw is turned.
Small angular-balance figures labelled a, b, c, d
At the right are small triangular balance diagrams whose pivots and hanging elements are marked a, b, c and d, comparing how freely each suspension moves.