सिद्धान्तदर्पण (महामहोपाध्याय सामन्त चन्द्रशेखर सिंह - नग्न-नेत्र खगोल वेध एवं गणित महाकोश)

' or 'र्न'?
Wait, could it be "र्कोनल"?
Wait, look at the translation:
"जिस प्रकार रवि और आग का गुण उष्म होता है"
रवि (अर्क) और आग (अनल).
अर्क + अनल = अर्काऽनल!
If the author adapted the Siddhanta Shiromani verse:
Original: "यथोष्णताऽर्काग्न्योश्च शीतता विधौ"
Here, instead of "अर्काग्न्योश्च", the author wrote:
"र्कोनल योश्च" or "र्कानल योश्च" or "र्काऽनल योश्च"?
Wait! Let's look at:
य थ ो ष् ण ता
Then:
र्का or र्को?
Wait, the top of the letter after space:
There is a repha! It curves to the right from the top of the vertical stem!
And to the left of the stem is a loop like 'क'!
So it is 'र्क'!
Wait, is there an aa-matra or an o-matra or an avagraha?
There is a vertical line with a repha? No, the vertical line has 'क' attached.
Then the next letter is 'न'!
Wait, is there a letter between 'क' and 'न'?
No! It is: 'र्क' then 'न' then 'ल'?
Wait, is it "र्कानल"?
Wait, look at the repha: