In 1840 Lieutenant Henry Raper, in his famous Practice of Navigation, declared, too, that taking the figures from tables was so speedy as to make any form of Gunter's Scale unnecessary.
Ngo1840 uLieutenant Henry Raper, kwincwadi yakhe edumileyo u"Practice of Navigation" wapapasha ukuba ukususa amanani kwisicwangciso kulula kuyakhawuleza nto leyo ebanga ukuba kungabikho mfuneko yakusebenzisa isikali sikaGunter