That’s nothing for acronyms. The NMR guys practically a competition for creating memorable acronyms. Among them are:
PENIS Proton-Enhanced Nuclear Induction Spectroscopy (NMR technique)
SECSY: Spin Echo Correlated Spectroscopy
WATERGATE
- Water Supression Pulse Sequence
WURST: Wideband, Uniform Rate, and Smooth Truncation
HOHAHA: Homonuclear Hartmann-Hahn Spectroscopy
And thats just a partial list. The full list is:
http://www.bmrb.wisc.edu/education/nmr_acronym?HOHAHA
As far as how did they know how compounds were connected in the 19th century. The ninteenth century is really where chemists were figuring out how things were bonded. In the early 19th century, it was still not universally accepted that certain elements only had certain numbers of bonds. For example, carbon always has 4 bonds (excepting ions, carbenes, and radicals, but they didn’t make too many of those back then.) It is quite possible that they did not absolutely know the structure of ethanol. On the otherhand, those that accepted the carbon = 4 bonds oxygen = 2 bonds and hydrogen = 1 bond had only a few ways to put ethanol together. The structure you are describing, where the oxygen is in the middle is called dimethyl ether, an isomer of ethanol (isomer means it has the same numbers of elements but arranged differently.) A chemical test would easily distinguish between dimethyl ether and ethanol.
The real brilliance came in the later part of the 19th century. Benzene has the formula C6H6. Just based on this formula this molecule is very unsaturated (meaning lost of double bonds or rings.) Benzene was notoriously unreactive for an unsaturated molecule. When they did get derivatives of this compound a single substitution only produced 1 compound. That meant that every carbon was equivalent so the molecule must have been highly symmetrical. Even more perplexing was that a double substitution produced 3 isomers rather than 5. Eventually they discovered a new bonding method based on conjugated (alternating double and single bonds) rings called aromaticity.
Werner complexes are another example of brilliant chemistry. While carbon strictly adheres to the octet rule metals were very ambiguous about how many things they were bonded to. Based on reactivity, the number of isomers (symetrical bonding motifs have fewer isomers) and such things they were able to definitively prove the structures of these molecules.
Basically, before NMR, X-ray, IR, and mass spectrometry the structure of compounds were detremined using chemical tests to determine functional groups, symmetry, and sheer logic through the process of elimination.