What was the audio-visual device in 2889? (i) Commutators (ii) Phototelegram (iii) Phototelephote (iv) Aero-car
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3
Answer:
Phototelephote
Explanation:
Phototelephote
Answered by
1
Explanation:
To make our judgement more reliable and precise, we need a common unit of measurement. The calculation for proper support should be the same in case of everyone. Thus, measurement uniformity should be present. We need a popular set of measuring units, which are called regular units, just for sake of uniformity.
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