295 



the Chicago Historical Society, dated February 29, 1860, 

 desiring to form and sustain friendly relations with the So- 

 ciety ; and from the Editor of the Gas Light Journal, dated 

 New York, March 13, 1860, offering to sell a printing press, 

 said to be the one on which Benjamin Franklin worked when 

 a boy of fourteen years of age. On motion of Mr. Fraley, 

 the offer was declined. On motion of Dr. Bache, the Chicago 

 Historical Society was placed on the list of corresponding so- 

 cieties. 



The following donations for the Library were announced : — 



Reinwald's Catalog. Annuel. Vol. ii. Paris, 1859. — From the Autlior. 

 Bulletin Soc. Geog. Paris, xvii. Jan. to June, 1859. — From the So. 

 Robinson^s Armagh Cat. of 5345 Stars. 8vo. 1859. — From the Aut. 

 Cat. of Printed Books of N. Y. Hist. S. Lib. 8vo. l^b^.—From So. 

 Journal of the Franklin Institute, No, 411. — From the Institute. 

 Mayor Henry's 2d An. Mes. Phil. I860.— i^/'om City Councils, 

 African Repository. March, 1860. — From Amer. Col. Society. 

 Saggio di Bitterologia Messicana di Luigi Bellardi. Part 1. 4to. 

 Torino, 1859. — From the Author. 



Mr. Lea read a letter from Dr. James Lewis, of Mohawk, 

 N. Y., accompanied by drawings descriptive of a self-register- 

 ing thermometer, registering on a fillet of paper, with a prick- 

 ing point, at intervals as short as fifteen minutes if desired. 



REGISTERING THERMOMETER. BY JAMES LEWIS, 

 MOHAWK, N. Y. 



The apparatus, for convenience of description, may be di- 

 vided into three parts. 



First. The Thermometer, consisting of a bundle of iron and 

 brass wires (No. 13 wire measure), which bundle comprises, 

 within a length of about 15 inches, the equivalent of about 45 

 inches of iron wire antagonized by an equal length of brass 

 wire. These wires are arranged around a centre, instead of 

 being placed in alternate pairs each side of a centre, for the 

 purpose of making each individual wire contribute its share of 

 stiffness to the stiffness of the whole bundle ; also for the 

 purpose of giving equal rigidity to the circular plates which 



