A question from construction of psychrometric chart

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The discussion centers on understanding the placement of a wet-bulb temperature of 69 degrees Celsius on a psychrometric chart and its relationship to the saturation line at 100% relative humidity. Participants clarify that the wet-bulb temperature should be interpreted as 69 degrees Fahrenheit, not Celsius. It is explained that at 100% humidity, the wet-bulb and dry-bulb temperatures are equal, while at lower humidity levels, a wet-bulb depression occurs. The mechanics of a psychrometer are also mentioned, highlighting the evaporation process that cools the bulb and affects the readings. Overall, the conversation emphasizes the importance of accurately interpreting temperature readings in relation to humidity on the psychrometric chart.
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There is wet-bulb temperature of 69 centigrade in the picture which I cannot understand how it is placed there and what is the relation between it and saturation line (RH of % 100)

Thank you
 

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There's some sort of problem with the attachment.
 
The diagonal lines are constant wet bulb: so that's the label of the line it is next to.
 
this the second related picture
 

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mech-eng said:
There is wet-bulb temperature of 69 centigrade in the picture which I cannot understand how it is placed there and what is the relation between it and saturation line (RH of % 100)
Isn't it 69 degF not C ?

It'd be placed vertically above the 69 on horizontal axis
because
at 100% humidity , wet bulb and dry bulb are the same ? And at any other humidity there's wet bulb depression ?

Remember what's going on on that psychrometer - moisture is evaporating, cooling the bulb. They're plotting that depression.
 

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