What’s the oldest book in NFPA’s Charles S. Morgan Library?

In the Library, we are frequently asked, "What's is the oldest book you have"? One of the oldest works we have is Electric lighting, and the underwriters' standard requirements in reference thereto, with instructions for the proper inspection of electric light equipments, illustrated (1882). One of the illustrations, a diagram of the mode of operation of the Weston Current Indicator, is shown to the right. The introduction, writen by Henry Morton, PhD., begins "The nature of Electricity, or the final cause of those phenomena we call electric, is something about which we are absolutely ignorant, although we know so much...