Whitmer describes the plates as being 8x7 inches.

Feb 4, 1888
News (traditional)
Chicago Tribune

"David Whitmer Passing Away," Chicago Tribune (January 24, 1888); reprinted as “David Whitmer Dead,” Saints’ Herald 35, no. 5 (4 Feb 1888): 67.

The Saints' Herald, Chicago Tribune
Emma Hale Smith, Chicago Tribune, David Whitmer, Joseph Smith, Jr., Oliver Cowdery
Reading Public

It was during the early part of June, 1829, that David first heard that a young man named Joseph Smith had found an exceedingly valuable golden treasure in the northern part of the county. In company with his brother-in-law, Oliver Cowdery, young Whitmer set out to ascertain the truth or falsity of the story. Smith, who was at that time living with his father on a farm near Manchester, was indisposed at first to exhibit his treasure, but was finally persuaded to do so. The treasure consisted of a number of golden plates about eight inches long, seven inches wide, and of the thickness of ordinary sheet tin. They were bound together in the shape of a book by three gold rings. A large portion of the leaves were so securely bound together that it was impossible to separate them, but upon the loose leaves were engraved hieroglyphics which were unintelligible to any person who had seen them. With the tablets was an immense pair of spectacles set in a silver bow. Smith announced that he had been commanded to translate the characters upon the plates as soon as possible, and stated further that the work must be done in the presence of three witnesses, Smith, his wife, Cowdery, and Whitmer then proceeded to the house of Whitmer’s father, where the work of translation was carried out, Smith reading the characters by means of the magic spectacles, Cowdery, Christian Whitmer, a brother of David, and Smith’s wife acting as amanuenses.

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