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Provenance<br />
T<br />
.he <strong>harmonic</strong> <strong>analyzer</strong> depicted in this book has<br />
a nameplate affixed to its base that declares this particular<br />
machine was built by “Wm Gaertner & Co.” This<br />
small plate, 100 mm by 55 mm, helps date the machine.<br />
This company started in 1896 and then changed its name<br />
in 1923 to “The Gaertner Scientific Corporation.” So this<br />
machine must have been built between 1896 and 1923.<br />
The manufacturer and the date range for its manufacture<br />
are the only solid facts we have about its provenance—<br />
Several centimeters from the nameplate, a single<br />
‘2’ is stamped in the corner of the baseplate.<br />
This machine may have been the second model<br />
manufactured in a particular production run.<br />
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