Extension Tuning Hammers
I never saw a Mueller hammer with an aluminum handle, but it is interesting to see that alternative materials were advanced to production, even back in 1903. The locking nut which compresses the collet to secure the adjustable shaft was not a new idea. That idea was introduced by Francis Hale in 1885.
Charles R. Mueller (1868–1935) tuning hammer patent:
Both have a straight, and not tapered, thread with a friction mating/locking surface. The earlier version has a smaller diameter thread compatible with other Erlandsen hammers, and the later thread has a larger diameter, almost as large as the diameter of the shaft itself. A locking ring has been added to provide a secure fit.
Three Mueller ‘Improved’ Extension Tuning Hammers. These were made around the WW1 era, and through the 1930s; the one on the bottom is an earlier version, the same as the illustration in the article above.
There are three different years given for the Mueller introduction/patent: 1891 in the Music Trades Review, Oct. 3, 1888 as inscribed on this hammer (I’m not sure if this is a mistake–it does not look like an over-impression of nines), and Oct. 3, 1899, the actual patent date. This is the earlier version with two tapering blocks as described in the above article:
Historical inaccuracies were common in the U.S. trade catalogues, even when it pertained to their own history. Apparently there were/are no history majors on staff!
This is a later version, which has a larger adjustment nut, and only one tapered wedge that works on a flat part of the shaft visible in this photo. It was made by Julius Erlandsen through the 1930s, and as late as 1940. Both versions securely lock down the shaft in a positive manner
This early Erlandsen type hammer is inscribed with an “H” only, presumably when the company was known as A. Hammacher and Co. between the years of 1867 and 1883, after which “Schlemmer” was added to the company name: