ADMINISTRATIVE REPORT 
2 3 
SAND AND GRAVEL. 
The sand produced in Florida is used chiefly for building pur¬ 
poses, although a limited amount is used as moulding sand. The 
gravel produced finds its chief use for road-making and road ballast. 
The total production of sand and gravel for 1914 was 177,241 tons, 
valued at $54,120.00. Of this amount 98,435 short tons, valued at 
$10,637.00, was gravel, the balance being sand of the grades men¬ 
tioned. 
The companies reporting the production of sand and gravel in 
Florida during 1914 are the following: 
Atlantic Coast Line Railroad Company. 
Florida Sand and Shell Company, Tampa, Fla. 
Interlachen Gravel Company, Interlachen, Fla. 
Logan Coal and Supply Company, Jacksonville, Fla. 
W. E. Long, Orlando, Fla. 
R. L. Martin, Ocala, Fla. 
Wialter L. Wescott, Orlando, Fla. • 
Woodmar and Company, Ocala, Fla. 
SAND-LIME BRICK. 
The materials used in the manufacture of sand-lime brick are 
sand and lime. The bonding power of the brick is due to the chem¬ 
ical reaction between these ingredients. The chemical changes oc¬ 
cur in presence of heat, pressure and moisture and result in the 
formation of hydro-silicates of calcium and magnesium. 
The sand used in the manufacture of sand-lime brick should be 
comparatively pure and preferably with some variation in the size 
of the grains. The mixture of lime, sand and water, is cut in the 
form of bricks and conveyed to a hardening cyclinder. Necessary 
heat and pressure are obtained in the hardening cyclinder adapted 
for the purpose. The sand-lime bricks are placed in this cyclinder 
and subjected to a pressure and temperature which vary according 
to the method of treatment. 
Four companies were actively engaged in the manufacture of 
sand-lime brick in Florida during 1914 as follows : The Bond Sand¬ 
stone Brick Company, Lake Helen, Fla.; The Composite Brick 
Company, 425 St. James Bldg., Jacksonville, Fla.; Plant City Com¬ 
posite Brick Company, Plant City, Fla., and the Valrico Sandstone 
Company, Valrico, Fla. 
The total production of sand-lime brick in Florida during 1914 
was valued at $105,435.00. This is an increase of $25,756.00 in 
value over that of 1913. 
