108 REPORT OF NATIONAL MUSEUM, 1922. 



features were designed and incorporated in several of the models 

 with such success that the preparator is enabled now to devote con- 

 siderably more time to new work. 



Because of the large amount of power consumed in operating the 

 models, together with that of illuminating transparencies, a survey 

 was made in an endeavor to determine what savings could be effected. 

 As a result certain changes were made in the methods of illumina- 

 tion; changes were made also in the time schedule of the working- 

 models, resulting in the saving of 400 kilowatt-hours of power since 

 February 1. As the exhibits now stand, they are all in excellent 

 condition. 



During the year in the division of mechanical technology a plan 

 was evolved which in its realization will, it is believed, increase the 

 instructive value of the collections. Briefly, it is to make the objects 

 tell a story rather than merely represent a period in development; in 

 other words, to increase both the atmosphere of the object and the 

 data on the label so that a visitor will be impressed with the signifi- 

 cance of the material rather than being reminded only of its exist- 

 ence. To this end, the division is combing over all the collections — 

 stressing the important ones and placing each object where it will 

 obtain the desired results. Together with reinstallation, the ma- 

 terial is thoroughly repaired where necessary. Bad material is re- 

 placed; new bases made, if needed; mistakes in construction reme- 

 died; all with a view to in every way increase both the appearance 

 and worth of the object. Briefly stated, efforts have been directed 

 and realized as follows: 



Mechanical engineering. — The various engines and machines have 

 undergone thorough cleaning and repair, together with rearrange- 

 ment. All of the various meters and instruments have received ex- 

 cellent care and are being further increased in value by explanatory 

 labels. 



Electrical engineering. — The interesting series of exhibits portray- 

 ing the development of the incandescent electric lamp was brought 

 up to date and rearranged. The telephone exhibits were rearranged 

 and added to. Motors, meters, and all phases of electricity have 

 received intelligent attention. 



Marine engineering.— During the process of photographing the 

 major part of the collection, all boats were repaired and cleaned, a 

 thing much needed and which has made a decided improvement in 

 the presentation of the exhibit. Several models received in unfin- 

 ished or damaged condition have been made suitable for exhibition. 



Transportation. — All exhibits connected with land transporta- 

 tion — manumotive, animotive, locomotive, and automotive — have re- 

 ceived proper attention and have been enhanced by additions. The 

 exhibit of automotive accessories has been placed in better relation 



