text:  Let the practical man then build his ships skilfully and well after the best models and of the soundest oak--let their timbers be Kyanized their cables of iron their cordage and sails of the most approved make and material--let their sailors be true men and fearless and let stores be providently laid in for the voyage; but let not the trembling needle of science be forgotten; for though the distant harbour he would gain be well known to him--without the aid of the needle he may never be able to reach it