Workshop mills and a grinding machine with part dimensions
Silk mill, glass furnace and gem mill on blue paper, with gear ratios and columns of arithmetic
On blue-prepared paper, this torn sheet gathers studies of workshop machinery — a silk mill, a glass furnace and a mill for polishing gems — alongside a grinding machine given with the dimensions of its parts in ounces. Memoranda list tasks and materials, and note that cord should be waxed or soaked in linseed oil against water. Gear ratios are worked out (a carriage turning eight times for each turn of an eight-ounce wheel) and columns of arithmetic fill the lower corners. Many further faint mechanical sketches cover the sheet beyond the transcribed notes.
On this page
Grinding machine given piece by piece in ounces
A machine for grinding is drawn with the dimensions of its individual pieces: two ounces, half an ounce, then four pieces of one ounce, summing to eight ounces in all. A detail specifies a bolt half an ounce thick and one ounce wide.
Gear ratio: carriage turns eight times per wheel turn
The carriage weighs one ounce and the wheel eight ounces; the carriage will make eight turns for every single turn of the wheel. The whole bench is two-thirds wide, the cogs two ounces each.
Memoranda of mills and workshop tasks
A short list names a silk mill, a glass furnace and a mill for polishing gems, and reminds the writer to learn to make cords in a circle for the throwing-frames.
Reminder about a cap
Two lines record a personal errand: a cap received from the master, and a cap to be given to the mistress.
Waxed cord against water
A note beside an analogous machine specifies that the cord be waxed on account of the water, or else soaked in linseed oil.
Centring a rib, labels a b c
A detail at the upper left carries the labels c b a, noting that e equals a b; the arrangement is made so that the rib stays in the middle of the twisted part.