The slide rule consists of housing with two knobs, 2 dials (one of which revolves with the aid of the black knob),
2 pointers (which revolve in unison with the aid of the red knob), and a fixed indicator.
The fixed indicator is on side 2, directly aligned with the black knob.

There are 3 scales on the fixed dial on side 1:

• The outer scale- for basic calculating. It is the inverse of the inner moveable scale on side 1 (equivalent to a DI scale);
• The middle scale S- for calculating the sines of angles;
• The inner scale T- for calculating the tangents of angles.

• The outer scale - the scale of the squares (equivalent to an A scale);
• The inner scale -for basic calculating (equivalent to a C scale).

MULTIPLICATION
(using the moveable internal scale, fixed indicator, and moveable pointer on side 2)

• Rotate the black knob (2) to position the index (of the inner moveable scale) under the fixed indicator (5).
• Rotate the red knob (3) to position the moveable pointer over the first cofactor (on the inner moveable scale).
• Rotate the black knob to position the second cofactor (on the inner moveable scale) under the fixed indicator.
• Read the product under the moveable pointer (on the inner moveable scale).