Request: Could you identify this hardware?

Those girls look like they are using a very large incidence rangefinder.

It uses angles with mirrors to estimate range optically.

Ie you point it at a distant target and turn the adjustment knob until the two images are aligned and match. The number on the knob will tell you the approximate range to the target.

Small ones are used by one person to determine range... this one looks huge and is probably for artillery or aircraft range finding...

Early T-72s had them before they got laser rangefinders...

Just based on angles of triangles... get a long tube and put mirrors at each end... the longer the better as that is the base line of your triangle.

In the centre have two eye pieces with each eye piece showing the image from one mirror and have them split vertically so the left mirror shows the bottom half of the view and the right mirror shows the top half of the view... turn the knobs to precisely change the angle of the mirrors until you form a complete tank in the top and bottom mirrors and the angles of the mirrors can be used to determine range to the target. A more sophisticated system has the calculated range in the optics based on the angle of the mirrors... the base of the triangle is a known distance so using the angles of the mirrors the distance to the target is a simple calculation.

Passive, cheap, and accurate enough for most firing purposes with direct fire weapons.

Can someone identify what device this is or what those girls are doing?

It looks like an optical range finder... it was used before laser rangefinders became cheap.

It is essentially a long tube that is like a periscope except at each end is a telescope. Along the tube are two optical tubes you can look into but one eyepiece has the view from the telescope at one end and the other eye piece has the view from the telescope at the other end so it is like moving your eyes to be 2-3 metres apart.

The result is that your view the target from slightly different angles and you have a control that changes the angles of the telescopes that has a distance indicator on it, so if you are looking at a target that is close you turn the telescopes to point inwards at a sharp angle to get a view of the target... the further away the target is the closer to parallel the telescopes have to be to view it properly... the angle of the telescopes with the distance they are apart means a simple calculation to determine distance to the target... obviously the further apart the two telescopes are the more accurate it is at greater and greater distances.

Called an optical range finder, often used on tanks... very early T-72s had them, but they have been made largely redundant by Laser range finders.