Plate Number 521. A: Walking. B: Ascending a step. C: Throwing the disk. D: Using a shovel. E, F: Using a pick. Dated: 1887. Dimensions: image: 28.6 ? 25.7 cm (11 1/4 ? 10 1/8 in.) sheet: 48.4 ? 61.2 cm (19 1/16 ? 24 1/8 in.). Medium: collotype. Muse