110 REPORT OF NATIONAL MUSEUM, 1922. 



advanced and a drawing of the completed exhibit, together with 

 text, prepared for free distribution. 



Of the several branches of activities in the division of mechanical 

 technology, that devoted to marine engineering, or naval architec- 

 ture, more nearly approaches the ideal in thoroughness and complete- 

 ness than any other. With the cooperation of the United States 

 Fish Commission, this branch was brought to its present state many 

 years ago, and a descriptive catalogue of the collections was begun 

 by the late Capt. Joseph W. Collins. Believing that this catalogue 

 should be completed, the writer spent the greater part of the year 

 in studying the collection and preparing new data, rearranging and 

 editing the data previously recorded by Captain Collins, and arrang- 

 ing the whole for publication as a bulletin. This manuscript, 

 together with illustrations, was submitted for publication about 

 April 1. 



The special investigations begun last year by Paul Garber, aid. 

 for the purpose of visualizing the developments in aeronautical 

 engineering, were continued and resulted in the construction of a 

 model of the aircraft proposed by Henson in 1810 and the beginning 

 of another model of the aircraft proposed by Sir John Caley. 



Toward the close of the year the division of mineral technology 

 began work upon a model visualizing the manufactured-gas industry 

 to be incorporated in the fuels exhibit. The Museum is indebted 

 to Samuel S. Wyer, Columbus, Ohio, for securing practically all of 

 the data necessary to carry forward this work, who had, in addi- 

 tion, the cooperation and advice of prominent individuals connected 

 with the manufactured-gas industry. 



The division of mechanical technology has received in times past 

 incandescent lamps of undetermined origin and make and has re- 

 ceived material help from Henry Schroeder, of the Edison Lamp 

 Works of the General Electric Co., in identifying these objects, as 

 well as other objects pertaining to electrical illumination. 



NUMBER OF SPECIMENS IN THE COLLECTIONS. 



During the year a complete inventory was made of the collections 

 assigned to the division of mechanical technology, Museum cata- 

 logues as far back as 1876 being carefully examined and checked 

 with the specimens. Of the 7,798 specimens in the division, it was 

 found 5,813 are on exhibition, the remaining 1,985 being in the study 

 series or storage. 



Number of specimens received during the year 



Total number of specimens in the collections at end of year. 



Division 

 of mineral 

 technology 



30 

 3,808 



Division 

 of mechan- 

 ical tech- 

 nology. 



356 

 7.798 



