REPORT OF NATIONAL MUSEUM, 1921. nla lg 
the typewriter; a model two times enlarged of the type bar action; 
a model two times enlarged of the roller trip escapement; and the 
complete Royal typewriter. 
Activities and condition of collections Despite the handicap in- 
curred through the resignation of Miss Bartlett early in the year, re- 
sulting in a reduction of an experienced staff by one third, progress 
was made in connection with the maintenance of the collections. 
The work of reallocating the exhibits begun last year was continued 
satisfactorily, and efforts were successful to a slight degree in procur- 
ing new material to bring the several exhibition units more toward 
completeness. As a result of the rearrangement, a satisfactory 
amount of exhibition space became available, over 75 per cent of 
which was gradually made use of for the installation of valuable 
objects which, because of the crowded conditions existing before, 
were of necessity placed in storage. The preparation, repair, and 
installation of this material consumed fully 50 per cent of the time 
of the preparator and aid, the balance being used in the design and 
construction of new exhibits and the almost endless maintenance of 
the delicate objects comprising the greater majority of the collections. 
Prominent amongst the installations thus made, were the collection of 
bicycles and the collection of rails, both of which collections are 
becoming more and more valuable. Considerable time and work was 
likewise involved for the whole staff in caring for the materials con- 
tinuing in storage. Through the assignment of larger offices to the 
division, there became available several basement rooms, which were 
immediately used for the storage of materials assigned to the division 
but heretofore scattered in three separate places. At this time an 
examination of the materials was also made to determine what, if 
any, redisposition could be made, each item being considered sepa- 
rately. As a result, a group of 146 listed objects were transferred 
elsewhere. 
In furthering the definite program of eliminating all possible 
overlappings of the various Museum activities, there were trans- 
ferred to the division of history 79 objects, all but 2 comprising a 
biographical series relating to Joseph Henry. For this same general 
reason four models of boats were transferred’to the division of his- 
tory, their value in history being greater than their value as ex- 
amples of naval architecture. 
In the nature of new work mention may be made of the almost 
complete reconstruction of the “Stourbridge Lion” locomotive 
model following research conducted by this office, and the construc- 
tion of a model of the airplane designed by Leonardo da Vinci about 
1490 A. D. The necessary data for this work was obtained chiefly 
from a photostat copy of da Vinci’s notes and incomplete sketches. 
Construction of a model of the Hensen aircraft, designed by Hensen 
