TL;DR: In this article, a musical scale indicator is constructed along the lines of a sliderule, with fret and string markings in and adjacent a "window" which represents the guitar fingerboard.
Abstract: In a musical scale indicator which is constructed along the lines of a sliderule, the (fixed) sleeve has fret (2) and string (1) markings in and adjacent a "window" which represents the guitar fingerboard There is a smaller "window" (4), called the key indicator, giving the key information Within the sleeve, and within the larger window, is note information (3) of all the notes on the guitar fingerboard with the represented guitar in regular tuning The notes are represented in white for natural notes, and in black for sharps and flats, which is a useful way of displaying the information to musicians who also play keyboards The inner (movable) slide has a selection of holes to enable the relevant notes to be displayed Around the holes is block pattern information, necessary to instruct the player to play the scale stepwise within a limited area on all the strings There is code information also on the slide to clarify the information on the block pattern scales
TL;DR: In this article, the authors used double-grating Doppler interferometry to measure the nonlinear tuning curve of a regular tuning fork and achieved measurement accuracy within ten microns.
Abstract: Tuning fork experiments at the undergraduate level usually only demonstrate a tuning fork's linear resonance. In this paper, we introduce an experiment that can be used to measure the nonlinear tuning curve of a regular tuning fork. Using double-grating Doppler interferometry, we achieve measurement accuracy within ten microns. With this experiment setup, we observe typical nonlinear behaviors of the tuning fork such as the softening tuning curve and jump phenomena. Our experiment is inexpensive and easy to operate. It provides an integrated experiment for intermediate-level students and a basis for senior research projects.