It's a quote and a drawing from (an article I published two weeks ago). I was just wondering if it was featured in some kind of book or something. I'm rather proud of this particular article.
It looks like a technical army manual.
Interlinked; just to clarify things, your article has the quote (shown below) that ties the D-49 to the D-25TS...did you mean to say the tie is actually with the D-25TA?
The D-49 gun installed in the SU-122-54 casemate tank destroyer was essentially a D-25TS gun on a different cradle, configured to swivel in both axes."
I don't know, actually. I just wrote that based on what you've said in this forum hahaha
Like I said, I really know very little about the SU-122-54. My personal opinion is that the D-49 was developed together with the D-25TA and shares much more in common with that than with the D-25TS.
To answer one of your earlier comments: among the differences between the D-25TS and the D-25TA (that I'm sure of) was the addition of the mounting brackets for some stabilizer components underneath the gun cradle. This shifted the center of gravity a bit to the rear, so the gun cradle had to be modified accordingly. Another difference is that the D-25TS was connected to the TPS1 sight using a parallelogram linkage. The D-25TA had a direct coaxial connection to the articulated telescope head of the TSh2-27 sight. The D-25TS also had an electronic firing mechanism linked to the stabilizer that worked with the GUV-7 electric primer whereas the D-25TA only had a solenoid-actuated firing pin.
Personally, I doubt that the SU-122-54 had a gun stabilizer which makes it hard to believe that the D-49 is based on the D-25TS. Plus, the SU-122-54 used the articulated telescopic TSh2-22 sight so that's another design aspect the D-49 shares with the D-25TA. However, my personal suspicions doesn't count as a source, so I deferred to you instead.
I'll do some reading on the subject and if I come up with anything interesting, I'll update the article.
Edited by Interlinked, 18 August 2019 - 0502 AM.