The Pearson Model H turret miller was marketed through (and possibly manufactured by) the Graham Machine Tool Company of 19 Cleveland Place, New York 12, N.Y.
The machine was current in the late 1940s and 1950s and was an almost successful attempt to out specify the equivalent Bridgeport; the Ram was of the rigid dovetail type - a design Bridgeport introduced in 1952 to replace their round-ram model - and the swivelling vertical head was fitted with both hand-operated fine and quick feeds, and a power quill feed as standard A range of 8 speeds from 264 to 4100 rpm was provided by direct V-belt drive from a 1.2 hp motor, with the slower speeds provided through oil-bath lubricated backgears. The travel of the R8 spindle was 5.5 inches, at a time when the Bridgeport J head had 5 inches, the M head 3.5 inches - but with no power-feed option available on either. However, although the ram on the Pearson could be propelled backwards and forwards through the head casting by means of a handle operating on a rack-and-pinion gear, the head angles had to be set by hand, unlike the easy-to-operate and accurate worm-and-wheel arrangement provided for the Bridgeport operator. The Pearson also appears to have been able to mount only one head at a time, a great time waster when a second head for slotting, or even a duplicate head but with different tooling, could be set ready for instant use on the other end of the ram.
The counterbalanced quill was hardened and ground and lapped into the head casting for a fine fit - 4 rates of power feed were available from 0.0015" to 0.006" per revolution of the hardened and ground, ball-bearing spindle.
The table was 10" x 44" or 48" - with longitudinal travels of 28 inches and 30 inches respectively; the cross feed was a useful 10 inches, an inch more than the equivalent Bridgeport - although, as compensation, the latter could be specified with a 48-inch long table with a travel of 36 inches.
The table-feed dials were 4.5 inches in diameter.