All metal, consists of a steel C.P. rod, one meter long, accurately graduated in mms & fitted on heavy metal feet, with 4 fixed sliders with accessories.
A. Iron B. Brass

Same as above but 1½ meter long
A. Iron B. Brass

Improved design, one meter long for advanced research work, consists of two steel rods supported on heavy cast iron feet, provided with 4 metal sliders with accessories. One of the rods is engine divided in mms. Two of the sliders have transverse motion, superior.
A. with steel bright chromium plated rods
B. with both the rods covered with brass pipe

Same as above but 1½ meter long
A. with steel bright chromium plated rods
B. with both the rods covered with brass pipe

Comprising the undermentioned accessories, mounted on 1 1/2 meter long steel C.P. double rod senior optical bench
I Lamp holder
II Metal screen white, with cross slit
III Plane true titable mounted mirror
IV Lens assembly consisting of double lens holder with clamping arrangement for performing Nodal point experiments

Same as above but both the rods covered with brass pipe

Same as above but without optical bench.