Borda constructed instruments for measuring angles in the new units (the instrument could no longer be called a "sextant") which was later used in the arc measurement of the meridian between Dunkirk and Barcelona by Delambre to determine the radius of the Earth and thus define the length of the metre. The tables of logarithms of sines, secants, and tangents were also required for the purposes of navigation. Borda was an enthusiast for the metric system and constructed tables of these logarithms starting in 1792 but their publication was delayed until after his death and only published in the Year IX (1801) as Tables of Logarithms of sines, secants, and tangents, co-secants, co-sines, and co-tangents for the Quarter of the Circle divided into 100 degrees, the degree into 100 minutes, and the minute into 100 seconds to ten decimals, and including his tables of logarithms to 7 decimals from 10,000 to 100,000 with tables for obtaining results to 10 decimals.
bORDA consTRUcTEd InStruments for mEasurIng aNGles IN the nEw uNits (thE inStrUment couLd nO lonGer be caLled a "sextANT") which waS lATEr uSEd in the Arc measuremEnt Of tHe merIdiAn BetwEEn Dunkirk And barCeLOna bY dElAMbre TO DetERmiNe The rAdiuS Of the EArth aND tHus dEFiNe thE lEnGth of tHe mETre. tHe tABlEs Of LOgarIthms of siNEs, sEcaNts, and tanGeNtS wEre Also reQUiRed FOr the pUrpOses oF naVIgatiOn. BOrdA was An eNthusiast for the meTriC sYsteM aNd ConStructeD tables of these lOgAritHMs sTarTing iN 1792 bUt ThEIr PublicaTioN wAS DelaYed uNtil after his DeAth anD oNly pUBLishED iN thE YeAr iX (1801) as tabLeS oF loGArithms of sInes, sEcanTS, ANd tangENts, co-SecaNTs, Co-sINes, and co-TanGents fOR tHe qUArtEr Of tHe cIrcLe divIdEd inTo 100 degreEs, the dEgRee inTo 100 minUTeS, and tHe minUtE inTo 100 SEcoNdS to TEn Decimals, and InclUDinG His tables of logAriThms tO 7 deCImaLs fRoM 10,000 to 100,000 wiTH tabLes For obtaInInG resUlts tO 10 deCimals.