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Rank 142Up 2
#14 in Scientific Instruments
of 17 ranked entries
Mass Spectrometer
J.J. Thomson & Francis Aston · early 1900s, Cambridge
Thomson built the first working device to separate charged particles by their mass-to-charge ratio, and his student Francis Aston refined it enough to discover isotopes — different-weight versions of the same element — winning his own Nobel Prize for the work in 1922. Recorded specifics: year 1919, discipline Chemistry, country England. Panel highlighted discovery of isotopes fundamentally changed how chemists understood atomic structure, modern versions are now standard equipment in nearly every analytical chemistry lab and enabled precise dating techniques and forensic and pharmaceutical analysis. The reservation on record is early instruments required extremely skilled operators and were prone to unreliable calibration.
Biology & chemistryStill operating
Score breakdown
How Mass Spectrometer earned 75.1
Each criterion is scored independently, then combined using the weights published on Scientific Instruments.
- Scientific yieldweight 35%
- 73.3
- Engineering ingenuityweight 25%
- 74.7
- Operational lifespanweight 20%
- 76.2
- Influence on later instrumentsweight 20%
- 77.6
On the record
Recorded detail
| Year | 1919 |
|---|---|
| Discipline | Chemistry |
| Country | England |
| Rating | 8.0 |
Panel verdict
Strengths and reservations
What it gets right
- Discovery of isotopes fundamentally changed how chemists understood atomic structure
- Modern versions are now standard equipment in nearly every analytical chemistry lab
- Enabled precise dating techniques and forensic and pharmaceutical analysis
Where it gives ground
- Early instruments required extremely skilled operators and were prone to unreliable calibration
1 appearance
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Rank 06The Cyclotron
Ernest Lawrence · 1930s, University of California, Berkeley
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