Textbook writers and instrument-makers of the eighteenth century always drew a clear distinction between Hadley's quadrant (or octant) and Hadley's sextant.
Ababhali bencwadi nabenzi bezixhobo benkulungwane yeshumi elinesibhozo isoloko izotywa ngokucacileyo umahluko phakathi kwisahlulo sesine sesangqa sika Hadley (okanye iokhtant) nesixhobo sokulinganisa ukuphakama kwelanga sokufuna ubuphi belanga kuHadley.