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Blackboard bold used on a blackboard
Blackboard bold used on a blackboard
Typewritten lecture notes by Gunning (1966), showing "blackboard bold" style R and C achieved by double-striking each letter with significant offset.
Typewritten lecture notes by Gunning (1966), showing "blackboard bold" style R and C achieved by double-striking each letter with significant offset.
A page from Loomis & Sternberg (1968), showing an early example of "blackboard bold" style R and C in a printed book.
A page from Loomis & Sternberg (1968), showing an early example of "blackboard bold" style R and C in a printed book.
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NASA scientist Homer E. Newell Jr. explaining principles of altitude, pressure, and temperature, c. 1973
NASA scientist Homer E. Newell Jr. explaining principles of altitude, pressure, and temperature, c. 1973
A chalkboard with an eraser in the chalk tray
A chalkboard with an eraser in the chalk tray
Stick-slip effect with a chalk on a blackboard
Stick-slip effect with a chalk on a blackboard
Middle school chemistry on a blackboard in Beijing, China, 2011
Middle school chemistry on a blackboard in Beijing, China, 2011