(15) Cubits.--The cubit is the length of the arm from the elbow to the tip of the middle finger. As, further, it was regarded as one-fourth of a man's height, we may safely compute it at eighteen inches, except where the sacred or longer cubit is expressly mentioned. Thus the ark was 450 feet long, 75 broad, and 45 in depth. The Great Eastern is much larger, being: 680 feet in length. However simple her construction, there would be great difficulty in building so large a vessel, from the danger of her breaking her back, especially in the tempestuous weather which followed.

Verse 15. - And this is the fashion which thou shalt make it of. The shape of it is not described, but only its dimensions given. The length of the ark shall be three hundred cubits, - a cubit = the length from the elbow to the middle finger (Deuteronomy 3:11); nearly twenty-two inches, if the sacred cubit; if the common, eighteen inches, - the breadth of it fifty cubits, and the height of it thirty cubits. With a cubit of twenty-one inches, the length would he 525 feet, the breadth 87 feet 6 inches, dimensions not dissimilar to those of the Great Eastern which is 680 feet long, 83 feet broad, and 58 feet deep. The cubic contents of the ark with these dimensions would be 2,411,718'75 feet, which, allowing forty cubic feet per ton, would give a carrying capacity equal to 32,800 tons. P. Jansen of Holland, in 1609, proved by actual experiment that a ship constructed after the pattern of the ark, though not adapted for sailing, would in reality carry a cargo greater by one-third than any other form of like cubical content. The difficulty of building a vessel of such enormous magnitude, T. Lewis thinks, may be got over by remembering the extreme simplicity of its structure, the length of time allowed for its erection, the physical constitution of the builders, and the facilities for obtaining materials which may have existed in abundance in their vicinity. Bishop Wilkins ('Essay towards a Philosophical Character and Language'), Dr. A. Clarke, and Bush are satisfied that the ark was large enough to contain all the animals directed to be taken into it, along with provision for a twelvemonth; but computations founded on the number of the species presently existing must of necessity be precarious; and besides, it is at least doubtful whether the Deluge was universal, or only partial and local, in which case the difficulty (so called) completely vanishes.

6:12-21 God told Noah his purpose to destroy the wicked world by water. The secret of the Lord is with them that fear him, Ps 25:14. It is with all believers, enabling them to understand and apply the declarations and warnings of the written word. God chose to do it by a flood of waters, which should drown the world. As he chooses the rod with which he corrects his children, so he chooses the sword with which he cuts off his enemies. God established his covenant with Noah. This is the first place in the Bible where the word 'covenant' is found; it seems to mean, 1. The covenant of providence; that the course of nature shall be continued to the end of time. 2. The covenant of grace; that God would be a God to Noah, and that out of his seed God would take to himself a people. God directed Noah to make an ark. This ark was like the hulk of a ship, fitted to float upon the waters. It was very large, half the size of St. Paul's cathedral, and would hold more than eighteen of the largest ships now used. God could have secured Noah without putting him to any care, or pains, or trouble; but employed him in making that which was to be the means to preserve him, for the trial of his faith and obedience. Both the providence of God, and the grace of God, own and crown the obedient and diligent. God gave Noah particular orders how to make the ark, which could not therefore but be well fitted for the purpose. God promised Noah that he and his family should be kept alive in the ark. What we do in obedience to God, we and our families are likely to have the benefit of. The piety of parents gets their children good in this life, and furthers them in the way to eternal life, if they improve it.And this is the fashion which thou shall make it of,.... The form and size of it, its length, breadth, and height, as follows:

the length of the ark shall be three hundred cubits, the breadth of it fifty cubits, and the height of it thirty cubits; which some interpret of geometrical cubits, each of which contained six ordinary cubits; others of sacred cubits, which were larger by an hand's breadth than the common cubit; but the general opinion of learned men now is, that they were common cubits of eighteen inches long; and by the geometrical calculations made by them it is found, that the ark of such dimensions was abundantly sufficient to contain Noah, and his family, and the various creatures, and all necessary provisions for them (q). But if the Jewish and Egyptian cubit, the cubit of the Scriptures, as Dr. Cumberland (r) has shown it to be, consisted of twenty one inches and upwards, the ark according to them must be very near twice as great, and so more convenient for all the ends to which it was designed; for, as he observes, the cube of such a cubit is very near double to the cube of eighteen inches, and therefore so must the capacity be. (Noah's Ark was the largest sea-going vessel ever built, until, the late nineteenth century when giant metal ships were first constructed. The Ark was approximately 450 feet by seventy five feet; but as late as 1858"the largest vessel of her type in the world was the P&O liner, "Himalaya", 240 feet by thirty five feet...''In that year, Isambard K. Brunel produced the "Great Eastern", 692 feet by 83 feet by 30 feet of approximately 19000 tons ... five times the tonnage of any ship then afloat. So vast was Brunel's leap that even forty years later in an age of fierce competition the largest liners being built were still smaller than the "Great Eastern" ... (s). Editor.)

(q) Vid. Buteonem de Area Noe, Hostum in fabricam Areae Noc, & Poli Synopsin. Scheuchzer, ut supra, (Physic. Sacr. vol. 1.) pp. 37, 38. (r) Of Scripture Weights and Measures, ch. 2. p. 56, 57. (s) The World that Perished, John C. Witcomb, published by Baker Book House, 1988, p. 22.