Sm. 4to. (10 x 7 1/2 inches), publisher's burgundy cloth with a paper label on the spine (and a second label tipped in at the back). Top edges gilt, others untrimmed. First edition, limited to 350 copies, not to be confused for the 1969 Burt Franklin reprint. The work contains a memoir of Pickering; facsimiles (in red and black) of the many Pickering devices; a hand list of his publications; and 37 facsimile reproduction of various title pages. A useful and attractive book.