Better copy without the scan errors. Patent number is 984519. Much easier to read.
“From the rear of the trigger t the rib t2 projects, extending to the upper forward side of the catch y and there registering with a corresponding recess y5 in the catch (see Figs. 7 and 7a,) so located therein laterally that it permits the trigger to be operated whenever a magazine is in the grip and the locking-rib y2 of the catch y has locked the magazine therein, as, with magazine and catch in these relative positions, the inner face of the locking-rib y2 rests against the forward edge of the recess x1 in the magazine, and this contact prevents the catch y from being moved by its spring fully to the left side to its released position. When, however, the magazine is unlocked and withdrawn from the grip, the catch y on its release is at once moved by its spring fully to the left side, its movement in that direction being then only limited by the contact with its seat in the grip of the shoulder on the catch formed where the reduced left end and the body meet; in this released position of the catch the recess in its upper forward side does not register with the rib t2 of the trigger and therefore the trigger is then locked in the forward position against rearward movement or operation. This automatic locking of the trigger in the absence of the magazine positively prevents accidental firing, due to the pulling of the trigger in the erroneous belief that all cartridges have been removed from the pistol by the removal of the magazine, whereas an unfired cartridge may have remained in the chamber of the barrel.
On introducing a magazine into the grip the trigger is automatically released, ready for operation. “