CATALOGUE OF THE MECHANICAL. ENGINEERING COLLECTION. 107 



" Carreta " or Ox Wagon. Presented by Schutter and Hotz. 



This vehicle is of Spanish origin and was used extensively in 

 Mexico and New Mexico until about 1880. It is devoid of all metal 

 fittings and is made of cottonwood. The heavy wheels, composed of 

 three pieces of thick timber, are held together by dowels of wood. 

 The outer blocks show the traces of a rim. This type of wheel was 

 introduced by the Spanish and is still to be found in Spain. 



Cat. No. 180,132 U.S.N.M. 



Model of Method of Rolling Tar Barrels. 



Museum. 



(Scale 1:6.) Made in the 



The method of rolling loads by means of two tar barrels rolling 

 on parallel axles in the same frame was in vogue in North Carolina 



-COLiiXIAL CHAISE, 1770. 



in 1875 for transporting tar products obtained by "hacking" from 

 the forest to the steamboat or railway. Cat. No. 181,260 U.S.N.M. 



Model of Tobacco-Rolling Hogshead. (Scale 1:6.) Made in the Museum. 



The method of transporting tobacco by means of the rolling hogs- 

 head was in use throughout Virginia and neighboring States from 

 1750 to 1861. Oxen, mules, and horses w^ere employed in different 

 localities. ' Cat. No. 181,259 U.S.N.M. 



