This book was published in 1912 and has many, many pictures of classic-era lines (besides the Coolies shown here, the book has pictures of gray M-3490s, the M-3890 line, Duncan suspensions, etc.) URL: https://www.google.com/books/edition/Transmission_Line_Construction_Methods_a/LCJDAAAAIAAJ?hl=en&gbpv=1&printsec=frontcover