In order for his students to learn geography, in 1760 John created a set of pieces with parts of the world.
ເພື່ອໃຫ້ນັກຮຽນລາວໄດ້ຮຽນຮູ້ພູມສາດ, ໃນປີ 1760 ທ່ານ John ໄດ້ສ້າງຊິ້ນສ່ວນຕ່າງໆພ້ອມກັບພາກສ່ວນຕ່າງໆຂອງໂລກ.