Ellicott's Commentary for English Readers - Genesis 6:16
(16) A window.—Not the word so rendered in Genesis 7:11; Genesis 8:2, which means a lattice; nor that in. Genesis 8:6, which means an aperture; but “zohar,” light, brightness. In the dual, double-light, it is the usual word for “midday,” but it does not occur elsewhere in the singular. It was evidently a means, not merely of lighting the ark, but also of ventilating it; for as it was thickly covered within and without with bitumen—a point strongly insisted upon in the Chaldean Genesis—the two... read more
Ellicott's Commentary for English Readers - Genesis 6:15
(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... read more