File:Teacher at blackboard (1924).jpg
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![File:Teacher at blackboard (1924).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/6/68/Teacher_at_blackboard_%281924%29.jpg/683px-Teacher_at_blackboard_%281924%29.jpg?20210906142819)
Size of this preview: 683 × 600 pixels. Other resolutions: 273 × 240 pixels | 547 × 480 pixels | 875 × 768 pixels | 1,166 × 1,024 pixels | 2,332 × 2,048 pixels | 3,740 × 3,284 pixels.
Original file (3,740 × 3,284 pixels, file size: 4.09 MB, MIME type: image/jpeg)