This was my acclimatization wander too, but Mallory got the height wrong by some feet, It is much lower that the estimate which would have been the highest mountain climbed at the time if correct
From Mallory's diary/letters home.
6 July, climbing Ri-Ring
An early start at 4.15 am, straight up the stony slopes above our camp. After about an hour's going, I took some photos of Everest and some of his neighbours, all looking magnificent in the early sun. It was about 2,500 feet to the crest of our ridge: Bullock and coolies rather tired at this point; 40 minutes' halt and some food. Roped up for snow towards 8 am. A long upwards traverse to a snow col, where we halted, 9.30 to 10.10.
From this point we had to follow a long snow ridge and then rock and snow. Two coolies dropped out here, and the other three after an hour and a half more. Bullock and I plugged on, climbing now and then little steep bits of slaty rock, treading carefully along snow crests, occasionally cutting a few steps in ice to reach the arete again after a short traverse. Our interest was partly in what we saw, partly in the sheer struggle of getting on. We moved very slowly, keeping up muscular energy and overcoming lassitude by breathing fast and deep. It was a colossal labour. We reached the top at 2.45. The aneroid, which reads about 400 feet low, registered 23,500. After a week at our camp I consider this a good performance - a rise of 5,500 feet in the day. I have no doubt when we get better acclimatised and start from a higher camp we shall be able to go a great deal higher. It is a remarkable fact about mountaineering here, so far as our experience goes, that the descent is always very firing. It is only possible to keep oneself going by remembering to puff like a steam-engine.

Have a 5 for setting the scene. Think I'll write a bit of background about my new photos in future