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Item 1960B, Young's Modulus Apparatus, Searle's Design:
For experiment 1, is all the weight supposed to be hung on the hook below the steel wire or can it be hung on either hook? The hooks do not seem to be attached directly to the wire so I would think the total weight hung from both hooks would be split between the wires. Is this correct or is the weight on each wire the weight on the hook directly beneath that wire?
On top of the frame of the apparatus, a pair of chucks is provided to permit hanging of the frame through two wires parallel to each other. On the bottom of the frame, a hook is provided directly beneath each chuck. These hooks are used for suspending weights in order to induce longitudinal stress in the wires above the corresponding hooks. Both the metal base and the rectangular frames of the apparatus (on which chucks and hooks are mounted) are connected to each other with the help of flexible linkages that permit relative movement between the two. As such, on loading the weights, each behave independently and affect the respective wire only. Therefore, it is not required to load both hooks in order to induce longitudinal stress in any wire; only the respective hooks are to be loaded. In fact, the measurement of strain (or elongation produced) is done with the help of spirit-level and micrometer, which give the relative elongation of one wire with respect to the other wire (through the movement of one bar or rectangular frame with respect to the other).
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