Part 2 of the Codex Sinaiticus Exposed Series (How was Sinaiticus Written By Simonides?) is released here:. From Letter of C. Simonides, The Journal of Sacred Literature and Biblical Record, April 1863:

"First, that my uncle Benedict, being by profession a theologian, and versed in twelve languages, intending to publish both the Old and New Testaments, (Page 227) and the writings of the Apostolic Fathers with exegetic scholia of the ancient commentators, and specially to reply to what had been written against the Septuagint, [⚠️🚩] began this work while Professor in the College of Cydon in the year of 1784. Having removed to Mount Athos in 1819 for the sake of retirement, he embraced the monastic life in the monastery of Esphigmenos, he was named Benedict...While at Athos be gave himself up particularly to the study of the sacred Scriptures. ... I also visited Mount Athos in 1837, in which year the discovery of the library took place. I remained fourteen months at Mount Athos increasing my theological knowledge under my uncle at the same time studying, scientifically, paleography and archaeology.
'' I was taught the means of knowing the ancient MSS. of every period anil of every nation, their changes from time, also the knowledge of the skins, and the chemical preparation of the different writing-inks and the effects of the atmospheric changes of the different climates of the world. Further, I acquired the knowledge of the preparation of the skins of every city of the ancient nations and such other information as is requisite with regard to the indisputable evidence both of the spuriousness and genuineness of MSS. of every kind ; which information it is to be regretted is not possessed by any of the archeologists and paleographers of our day," "For this purpose I was urged by him to go to Athens, and provide these everything requisite for printing. I went and placed myself under the direction of A. Caromela for a sufficient time, he being then the first printer in Athens,..."

"I wrote to my uncle from Athens duly, that it was impossible for any one to obtain a proper printing press in Greece, because the Greeks themselves procured from France every requisite for printing. Being assured of this by others also, he recalled me to Athos. I sailed from the Piraeus in the month of November, 1839, and landed again at Athos for the fifth time. After a few days I undertook the task of transcribing the Codex, the text of which, as I remarked before, had many years previously been prepared for another purpose. ... Accordingly, having again revised the books ready for publication, and first Genesis, he gave it to me to transcribe. (Page 228)."
"I undertook this work, then, not as a tyro, but as one versed in the ancient writing;...I...had copied at twelve years of age the ancient inscriptions in the Aegina collection, besides four of the services at Mount Athos, in 1837, in golden letters, ancient and modern, as well as the service of St. Pantaleon in golden characters. ... Oh account of all these circumstances I undertook the work, and began immediately after the resignation of Dionysius to study the principles of caligraphy, as much as was needed. ... I learned the art of preparing suitable materials for writing — the proper Ink, the making of bone pens, the polishing of the skins, the cleaning by chemicals of a few leaves soiled by time, the careful and proper division of the columns, the adoption of the style of writing, and such other things as are proper to archeography. All these things belong to the graphic art. ..." "Besides, the penmanship of the Sinaitic Codex is my [my=Simonades] more usual style ; for in writing to patriarchs, archbishops, ministers, and men of high rank I adopted the same mode of writing with great facility, as you yourself write in the style which you learned from childhood."