18 size Elgin movements use one of two lever escapement styles; the "tangential" arrangement, where the lever is aligned on a tangent to the escape wheel, and the "perpendicular" arrangement.
These details show this example of the perpendicular arrangement.
The perpendicular design, like this one, is also referred to as a Swiss lever. It is a more stable, improved, style, that appears later.
Find a detailed example of the tangential design here... Note the direction of the end of the pallet fork, that faces the balance wheel when the movement is assembled.