APPENDIX TO THE KEPORT OF THE SECRETARY. 73 



7. Bureau of Hydrography. — The most interesting portions of this 

 was the collection of articles illustrating the various polar explorations 

 of Kane, Hayes, and Hall ; also specimens of charts prepared by the 

 Hydrographic Office, compasses, sounding apparatus, and the apparatus 

 used in the observations of the transit of Venus by the American par- 

 ties. 



C. — Treasury Department. 



1. The United States Coast Survey, and Bureau of Weights and Meas- 

 ures. — In this were shown a series of the weights and measures of the 

 United States, and the very complete apparatus used in the measure- 

 ment of base-lines for surveys. A series of the reports of the office, 

 and of its maps and charts, was also displayed. 



2. Light-Rouse Board. — In this were shown the different lanterns 

 used for purposes of illumination ; the different oils, wicks, &c; models 

 of light-houses, light-ships, &c. Outside of the building was erected an 

 actual light-house, in full working order, and lighted every night; as 

 also a fog-trumpet or syren of enormous power, capable of being heard 

 at a distance of many miles. This was used to indicate the time daily 

 for the opening and closing of the Centennial Exhibition. 



3. Revenue Bureau. — In this were shown the specimens of all the 

 forms of revenue-stamps, and the apparatus used in gauging, &c. 



4. Bureau of the supervising Architect of the Treasury. — In this, models 

 of various public buildings were shown. 



Specimens of United States currency, banknotes, &c, were also 

 shown by the Treasury Department, as also a complete life-saving 

 station, with boats, &c. 



D. — Post- Office Department. 



In this portion of the building was held the Centennial branch of the 

 Philadelphia post-office, fully meeting the needs of the Centennial Ex- 

 hibition, and kept up several weeks after the close. Here were seen in 

 operation machines for making stamped envelopes, samples of locks, 

 bags, &c, and two first-class railway postal cars. 



E. — Department of the Interior. 



1. Bureau, of Education. — In this division were shown models of 

 school-houses from different parts of the country and different periods 

 in our history ; school-furniture ; apparatus for educational purposes ; 

 samples of school-drawing and articles used in object-teaching,' illustra- 

 tions of the progress of the Indian tribes in education and civilization. 



2. Census Bureau. — This presented the original schedules of the cen- 

 sus of 1790, 1840, and 1870, illustrating the progress of the country by 

 the comparative magnitude of the records. 



3. The Patent-Office. — In this was shown a selection of models from 

 the Patent-Office, illustrating the more important stages of develop- 



