TY  - JOUR
T1  - An Account of a Micrometer Made of Rock Crystal
JF  - Philosophical Transactions of the Royal Society of London (1776-1886)
VL  - 111
SP  - 101
EP  - 103
PY  - 1821/01/01/
UR  - http://dx.doi.org/10.1098/rstl.1821.0010
M3  - doi:10.1098/rstl.1821.0010
AU  - Dollond, G.
ER  -