TY  - JOUR
T1  - Remarks on the Hadley's Quadrant, Tending Principally to Remove the Difficulties Which Have Hitherto Attended the Use of the Back-Observation, and to Obviate the Errors That Might Arise from a Want of Parallelism in the Two Surfaces of the Index-Glass. By Nevil Maskelyne, F. R. S. Astronomer Royal
JF  - Philosophical Transactions (1683-1775)
VL  - 62
SP  - 99
EP  - 122
PY  - 1772/01/01/
UR  - http://dx.doi.org/10.1098/rstl.1772.0016
M3  - doi:10.1098/rstl.1772.0016
AU  - Maskelyne, N.
ER  -