Changes

* - Go behind the control room desk and check that the black rheostat is dialed down to zero * - Flip the switch next to it to On * - Dial the rheostat up to 220 V (do not exceed that value as you will blow the lamps) * - The lamps on the top end of the telescope should now be on * - Open the mirror cover * - With the telescope vertical, rotate the dome to 127 degrees, so that the white flat-field screen is just to the east of the south pier * - Set the telescope RA to HA = 0 * - Slew the telescope in Dec to the south pole (-90 degrees), while keeping an eye on the spectrograph cables * - The cables will look like snagging, but they will not if you are at HA ~ 0 * - Slew Through the pole, to -86.5 degrees (on the other side of -90) * - Try not to overshoot as the pointing limit is at -85 on that side * - If you run into the limit, an alarm will sound and the telescope will stop moving * - To recover: turn the over-ride key next to the console while backing the telescope out towards the north in Dec * - With the telescope at HA ~ 0/12 & Dec ~ -86:30, the telescope should be quite well centred on the flat-field screen * - In the control room, take some trial exposures to check the count level, aim for ~40k counts * - The lamps are quite red, so blue settings (e.g. G4) struggle for counts * - In that case, it is fine to crank the slit wide open to let more light in (you do not care about resolution here) * - Take as many flats as you like (say, 11?) once you have established an appropriate exposure time * - When you have the flats, slew the telescope back to the zenith (again keeping an eye on the cables) * - Dial the rheostat down to zero * - Flip the switch to Off * - Close the mirror cover