He had, however, only land observations in mind, and it appears that he himself was already eliminating the effect of wind on the liquid surface by the device still in use today.
Wayenogqaliselo lwasemhlabeni engqondweni, kwaye kuyabonakala ukuba ifuthe lomoya kulwelo, lona wayesele elususa, ngesixhobo esisasetyenziswayo nanamhlanye