REPORT OF NEW JERSEY STATE MUSEUM. 4* 
chemical constitution and physical character of the samples 
were shown upon the labels. Forty or fifty other samples of 
raw clay completed this feature of the exhibit. 
.Specimens illustrating the origin of clays, the air shrinkage, 
the determination of the tensile strength, and the chemical, 
mineralogical and physical constitution were also prepared. 
The breaking and crushing strength of New Jersey brick 
had been the subject of long and careful examination by the 
Survey. This phase of our investigations was illustrated by 
a display of the fractured specimens and labels giving the re¬ 
sults of each of these experiments. 
Maps showed the distribution of clay and the location of 
clay-working plants and the mining, preparation and manu¬ 
facture of clay were illustrated by photographs as well as by 
a large model of Edgar Brothers’ Clay-Washing plant near 
Sayreville, N. J. The latter was an exact reproduction of 
the clay pits, storage houses, washing troughs and sluices, by 
which the sand and other impurities are separated from the 
high-priced ball clay. 
Samples of structural and fancy brick, floor and wall tile, 
terra-cotta, stoneware, fire-brick, etc., illustrated a few of the 
clay products manufactured from New Jersey clay, but there 
was no effort to make a complete exhibit of manufactured 
ware, the work of the Survey being with the raw materials. 
In this connection should be mentioned, however, the hand¬ 
some terra-cotta columns, which marked the entrance to the 
New Jersey clay exhibit and which were contributed by the 
Perth Amboy Terra Cotta Company. The enamel brick piers 
on which they were erected were furnished by The Sayre and 
Fisher Company and the American Enameled Brick and Tile 
Company. 
The clay exhibit was awarded a gold medal, and one of the 
judges a noted clay expert pronounced it the most complete 
exhibit of raw clays, and the methods of testing them he had 
ever seen. 
New Jersey has the well-deserved reputation of having the 
best maps of any State. Emphasis was, therefore, laid upon 
this feature of the exhibit. A large copper relief map, 15 
feet long and 8 feet wide, on a scale of one inch per mile, 
showed the topography of the entire State and was much 
