DEFINITIONS AND FORMULAE FOR STUDENTS (Telegraphy and Telephony).
Pp. viii+40(last 3 blank); small f'cap 8vo; printed blue paper wrappers, stapled, edges and backstrip lightly faded and rubbed, the upper wrapper faintly creased, with inked initials at top fore-corner and bookseller's sticker below author's name, a couple of tiny splits to top edge of lower wrapper; Sir Isaac Pitman..... More