Regarding “Art Review: Still Protesting, but to What End?” on the Whitney Biennial (Life & Arts, May 16): While I agree that “slave clock” has had common usage, I can point out that even in the 1920s these timepieces were more officially known as “secondary” clocks as you can see in the nearby image of a period catalog from the Standard Electric Time Co. of Springfield, Mass., which was the primary manufacturer of these time-distribution systems. It would be unjust and incorrect to state—as does the artist behind the “National...

Source: Wall Street Journal May 19, 2019 16:18 UTC