Expression "That last time"

[Haihao]

Hi,

Could you help me have a better understanding for the below passage?

[Mister Micawber]

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1-- Yes. Here, 'that' indicates that the speaker visualizes the occurence vividly, I think.

2-- A thermometer is an elongated object; the mouth hole in the plaster cast is thin-edged. Envision balancing your spoon across one edge of your coffee cup, and you'll get the image. 'By' of course only indicates the agents-- the two nurses-- who placed the thermometer there each morning.
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Native English teacher at Mister Micawber's

[Haihao]

Now I've understood everything, I guess. Thank you! Mr Micawber.