The Matheys "Semi-jigboring" machine was manufactured by G. Matheys of 36 Rue Gallait, Brussels, Belgium and sold during the 1940s and 1950s. It was a very well made tool, carefully finished and designed to be capable of undertaking both light milling work and accurate jig boring.
All three main feeds screws were all hand operated - there was no power feed option - and hardened and ground.  The table, the front of which was adapted to carry a slip block and a dial indicator holder - was 91/4" wide and available with a choice two lengths: 255/8" or  33 1/2"; the longitudinal travel of the shorter table was 173/4" and of the longer 253/4". The cross travel was 611/16".
Three drive options were offered: a single speed 1.35 hp, 700 rpm motor, a 3-speed motor and the 3-speed motor fitted to a continuously variable-speed drive unit. The motor sat at the back of the head and drove forwards through a 5-step V pulley to the head; speeds with the 1-speed motor were: 180, 300, 540, 930, 1750 rpm; with the 3-speed motor a very much more useful range of fifteen speeds: 180, 275, 300, 360, 450, 540, 600, 810, 930, 1080, 1400, 1750, 1860, 2600 and 3750 rpm. The variable-speed unit (in conjunction with the 3-speed motor) produced a range spanning  70 to 3500 rpm.
The spindle, fitted to accept Brown and Sharpe collets, had a travel of 5.5" and could be moved by either a quick-action rack or thorough a fine-feed worm-and-wheel gearbox; as an option, a clutched power feed was available and gave three rates of: 0.003", 0.006" and 0.009" per revolution. In addition, the whole head assembly could be moved up and down the main column over a distance of 77/8" - giving a total vertical travel of 133/8" and a maximum clearance between the table and spindle nose of 20".