Bolted frame with a note on bolt-heads and a multiplication
Red-chalk study of a braced frame, with the sum 160 × 12 = 1920
A large framework of uprights, cross-beams and diagonal braces is drawn in red chalk, with a drum or wheel at the right and a smaller detail sketched below. A caption records a note beginning 'All the heads of the bolts...', linking the drawing to the fastening hardware of the structure. In the lower right the sheet carries a worked multiplication (160 × 12), set out as partial products 320 and 160 summing to 1920. The transcribed note is truncated and faint additional writing is visible beside the frame that the bundle does not include.
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Note on the heads of the bolts
A caption begins 'All the heads of the bolts...', referring to the fastening hardware of the framed structure drawn above. The frame is built from vertical posts, horizontal beams and diagonal braces, with a drum or wheel at its right end.
Multiplication 160 × 12 = 1920
A worked calculation multiplies 160 by 12. The partial products 320 and 160 are stacked and summed to give 1920, set out in a small ruled grid.