This section is from the book "Scientific American Reference Book. A Manual for the Office, Household and Shop", by Albert A. Hopkins, A. Russell Bond. Also available from Amazon: Scientific American Reference Book.
There was a slight decrease in the quantity of carborundum - 3,741,500 pounds produced in 1902, as compared with 3,838,175 pounds in 1901 - due in part to lack of a sufficient supply of raw materials, a result of the anthracite coal strike. The value of the carborundum varies from 8 to 10 cents per pound.
The combined production of corundum and emery in 1902 amounted to 4,251 short tons, valued at $104,605, as compared with 4,305 short tons, valued at $146,-040, in 1901, a decrease of 54 tons in quantity and of $41,435 in value.
The production of crushed steel in 1902 was 735,000 pounds, as compared with 690,000 pounds in 1901, and the product is quoted at 5 1/2 cents per pound free on board at Pittsburg.
In 1902 the production of crystalline quartz included under abrasives amounted to 15,104 short tons, valued at $84,335, as compared with 14,050 short tons, valued at $41,500, in 1901. This large variation in value is due to the fact that in 1902 the value reported was in some cases that of the quartz after it had been crushed or ground. The actual value of the crude quartz produced in 1902 was $13,085.
The production of abrasive garnet in the United States during 1902 amounted to 3,926 short tons, valued at $132,820, as compared with 4,444 short tons, valued at $158,100, in 1901, and with 3,185 short tons, valued at $123,475, in 1900. As reported to the Survey the prices varied from $20 to $60 a ton, the highest price being obtained for the North Carolina garnet. The average value per ton of the production in 1902 was $35.10, as compared with $35.57 per ton in 1901 and with $38.77 in 1900.
The total value of all kinds of grindstones produced during 1902 was $667,431, as compared with $580,703, in 1901, an increase of $86,-728. The production of 1900, valued at $710,026, still remains the largest on record for any year. It should be remembered, however, that the price per ton has decreased from $15 to from $8 to $10, and that therefore the tonnage of grindstones used has correspondingly increased within the last few years. The imports for 1902 amounted in value to $76,906, as compared with $88,871 in 1901 and with $92,581 in 1900.
In 1902 the production of infusorial earth and tripoli amounted to 5,665 short tons, valued at $53,244, including 175 short tons mined as a by-product and valued at $1,436, an increase of 1,045 tons in quantity and of $294 in value, as compared with the production of 4,020 tons, valued at $52,950, in 1901.
The value of the production of millstones and buhrstones in 1902 was $59,808, an increase of $2,629 over the value of 1901. which was $57,179. The value for 1902 was almost twice the value of the production of 1900, which amounted to $32,858. From 1886 to 1894 there was a very large decrease - from $140,000 to $13,887 - in the production of buhrstones. Since 1894 there has been a gradual increase in the production.
There was a decided increase in the domestic commercial production of oilstones and whetstones during 1902, the value of which amounted to $221,702, as compared with $158,300 in 1901, an increase in 1902 of $03,462. Until 1902, the year of maximum production was 1899, when the value of the output amounted to $208,283. The crude production of oilstones and whetstones in 1902, as reported by the census, was valued at $113,968.
The volcanic ash deposits in Nebraska were worked to some extent in 1902, the product being used in the manufacture of certain soaps and scouring powders. The production of pumice amounted to 700 short tons, valued at $2,750.