A curious bit of nomenclature that I did not know, the "spectacular" sign refers to those epic scale, million light bulb and miles of neon tubing electric billboards. From the 1920's through the 1950's, Maxwell seems to have owned the Atlantic City Boardwalk.From Duke Library Archive:
The R. C. Maxwell Company produced electric "spectacular" signs and billboards and used the photographs to document construction and placement of those advertising signs on the boardwalk. Documentation of the placement of the signs involved using the photograph to show the client the specific physical location of the advertisement as well as using the photograph to give the client an idea of the pedestrian foot traffic that would see the sign.
Duke Library Archive of Maxwell's Spectacular Signs