William Sergeant Kendall

Two of these drawings, presumed to be by Kendall are for sale on Ebay.

Wikipedia article.

Catalog for sale on Amazon: William Sergeant Kendall/ American Master 1869-1938 

He studied with Thomas Eakins. 

A Drawing Manual by Thomas Eakins (Primary Sources in American Art)

Thomas Eakins: His Life and Art

Aurora Studios - Images for Artists

 In the early 1900s Aurora Studios, a Boston Photography Studio published a portfolio of photographs designed for the use of artists.  One series was published in 1913 and another in 1914. The models were in various stages of dress.

These photographs and others might have influenced Albert Arthur Allen to make his 1923 portfolio.

Image from La Petite Melancolie Blog.

Image from My Vintage Vogue - Vintage Fashion

Giambattista della Porta - Physiognomy

Giambattista della Porta was an Italian Scholar in the 16th and 17th century who wrote a book titled De Humana Physiognomonia. One of his contributions was a study of physiognomy which was the basis for later theories. Among the people he influenced was Johann Caspar Lavater.

Wikipedia Article.

Google Books result.

More images at the National Insitute of Health - Historical Anatomies on the Web.

More on the subject at Strange Science.

You can see more about them on Ebay.

The Pocket Lavater, Or, The Science Of Physiognomy: To Which Is Added An Inquiry Into The Analogy Existing Between Brute And Human Physiognomy, From The Italian Of Porta

Reading the Face: Understanding a Person's Character Through Physiognomy: A Spiritual-Scientific Study Physiognomy, the art of reading faces

Neoclassical Engravings

Hand colored neoclassical engravings. Don't know what period. You can see more about them on Ebay.

French Neo-Classical Drawings 1750 - 1825. Exhibition, Louvre Museum. Dessins Francais de 1750 - 1825. Le neo-classicisme.

Visions of Antiquity: Neoclassical Figure Drawings

Charles-Antoine Jombert and Charles-Nicolas Cochin

Venus, Study of Eyes

Two studies of hands

Proportions of Laocoon, proportions of the gladiator

Charles-Antoine Jombert was a bookseller who was closely associated with Charles-Nicolas Cochin from the time of his youth. Here is a link to an abstract of Charles-Antoine Jombert (1712-1784). Un libraire entre sciences et arts = Charles-Antoine Jombert (1712-1784), a bookseller for both science and the humanities by C. Bousquet-Bressolier. He published Catalog of the work of Nic Ch. Cochin. This is a link the title page.

A description of their relationship appears in French engravers and draughtsmen of the XVIIIth century By Lady Emilia Francis Strong Dilke.

Alibris has modern reprints.

I guess the images are prints of the work of Cochin that were published by Jombert. See them on Ebay

Detail of proportions of the Gladiator de Borhese

 Proportions of the Hercules Commode

Proportions of the Hercules Farnese