He may be said to have set the pattern which was followed in succeeding ages by the compilers of " political geographies " Geschichte der wissenschaftlichen Erdkunde der Griechen (Leipzig, 1891), Abt.
The subsequent development of rack railways is especially associated with a Swiss engineer, Nicholas Riggenbach, and his pupil Roman Abt, and the forms of rack introduced by them are those most commonly used.
Abt also developed the plan of combining rack and adhesional working, the engine working by adhesion alone on the gentler slopes but by both adhesion and the rack on the steeper ones.
Abt Vogler, however, makes reservations in his praise, condemning his philosophical principles as too much in sympathy with those of Fox, which had already been expressed by P. Vallotti.
