Decades: 290s BC 280s BC 270s BC 260s BC 250s BC - 240s BC - 230s BC 220s BC 210s BC 200s BC 190s BC
Years: 254 BC 253 BC 252 BC 251 BC 250 BC - 249 BC - 248 BC 247 BC 246 BC 245 BC 244 BC
... high explosive, gun-cotton[?], and obtained a transparent, jelly-like substance, which was a still more powerful explosive than dynamite. Blasting gelatin[?], as it was ...
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