- 26 Mar 2018 [16:00]
- a few tweaks, with John Aldridge: 1. stop pendulum to lower the prism by a couple of mm to make sure that the twist laser clears the clock-bed beam; 2. cleaned the prism (a fingerprint was causing a big diagonal difraction streak); 3. replace the laser screen with a 1mm polythene sheet; 4. calibrated the tilt level (found that it was pretty good, 1mV/mrad and that the zero-offset knob doesn't introduce scaling errors); 5. restart pendulum and check going, no regulation required.
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