TY  - JOUR
T1  - A Spirit Level to Be Fixed to a Quadrant for Taking a Meridional Altitude at Sea, When the Horizon is Not Visible. By John Hadley, Esq; V. Pr. R. S.
JF  - Philosophical Transactions (1683-1775)
VL  - 38
SP  - 167
EP  - 172
PY  - 1753/01/01/
UR  - http://dx.doi.org/10.1098/rstl.1733.0031
M3  - doi:10.1098/rstl.1733.0031
AU  - Hadley, J.
ER  -