Some 19 million tons of sulphur dioxide are discharged from US sources
alone each year, and another 14 million tons from Canada.(Using the
number "19" and the word "million" indicates an
approximate amount. "19,000,000" might make some readers think
it was an exact amount.)
It was not until after December 1952, when 4000 people died in London from
air pollution in just a few days, that real gains in pollution-control
legislation were made.
The US Army's standard airborne Doppler navigator weighs 28 lb (12.7 kg),
requires 89 W of power, and operates at 13.325-GHz frequency.
All vitrain of the European classification, if more than 14 micrometers
thick, has been regarded as anthraxylon.
In 1971, 11 countries accounted for about 91 percent of world production of
coal.
The Department of the Interior has just published a report that reviews 65
different coal gasification processes.
Combustion turbines total about 8% of the total installed capability of
US utility systems and supply less than 3% of the total energy generated.
Internal combustion engines in small power plants account for about 1% of
the total power-system generating capability of the US.
The water-cement ratio will generally range from 4 gal of water per sack of
cement to about 9 gal per sack. (These are exact values here; in
technical writing, use the numeral even if it is below 10.)
The problem is located in piston number 6. (When there are enumerated items
or parts, technical writing uses the number, as in this example. But notice
that no "#" or "No." is used.)
The signal occurs in 6-second intervals.
The order is for 6-, 8-, and 12-foot two-by-fours.
Use Code 3 if a system shutdown occurs.
Mined coals commonly contain between 5 and 15 percent mineral
matter.
The above illustration shows a 20-unit coaxial cable with 9 working coaxial
pairs and 2 standby coaxials, which automatically switch in if the
electronics of the regular circuits fail.
There are 59 different species of the coffee shrub, but only 4 are of
commercial importance.
Most grinds of coffee contain particles ranging in size from 0.023 to 0.055
inches in diameter.
Using carrier frequencies between 0.535 MHz and 1.605 MHz in the US, AM
broadcasting stations sprang up all over the country beginning in the
1910s.
As a base from which to work, 2-1/2 to 3 gal of water are needed for each
sack of cement for complete hydration and maximum strength. (These are
exact values; therefore, in the technical-writing context, we use
numerals. Notice how fractional values are handled: put a hyphen between
the whole number and the fraction to prevent misreading.)
The order for twelve 30-foot beams was placed yesterday.
The order was for 30 fifteen-gallon tubs.
They used six 8-pound sacks of nails.
The microprocessors of the 70s and 80s operated under the control of clocks
running at 1 to 5 MHz, that is, 1 to 5 million counts per second.
Your eye has a bandwidth of 370 trillion Hz, the visible spectrum.
Transmission rates on ETHERNET range from 1 to 10 megabits per second
(0.125 to 1.25 million bytes per second).
In 1978, the satellite carriers' revenues were about $88 million, and by
1986, they are expected to reach $800 million.
Most communications satellites are in geostationary orbit: at an altitude
of 22,300 miles over the surface of the earth and at a distance of 26,260
miles from the center of the earth (the earth's radius being 3960 miles).
Aggregates constitute about 70 percent of a concrete mix.
Uniform compaction of 95% or better of standard AASHO densities is
recommended.
In this book, Chapter 7 discusses the different audiences of technical
prose and translation techniques for communicating effectively with the
less specialized ones.
The wheels of the four-wheel tractor give it increased speed over the
Crawler, but because of the weight distribution over four wheels rather
than over two wheels or tracks, this vehicle has less traction.
Hundreds of thousands of people will have purchased microcomputers by the
end of 1980. Tens of millions of them will bought them by the end of the
century.
There are two telephones in service today for every three people in the
US.
In 1965, Dr. Gordon Moore announced his "law" that the complexity
of a chip would double every year for ten years. (Use the word
"ten" here because it is not an exact amount.)
The typical stand-alone microcomputer system consists of seven physical
components. (Use the word "seven" here because, even though it
seems like an exact amount, it is not a key value. It doesn't have the same
significance as the "7"would have in "7 quarts of
oil.")
If you are using page-zero addressing, use a RAM for memory page zero.
Primary fuel cells are those through which reactants are passed only one
time.
Before recharging, a zinc-carbon battery must have a working voltage not
less than one volt. (Even in technical-writing contexts, rules for one
and zero vary. Just pick a style and stay with it. Using the word
"one" is the standard in this example.)
Japan has roughly one-third of the US production of dry batteries. (In
running text, always write out fraction like this, and hyphenate
them. However, you'd still write "5-1/2 inches.")
The radial fractures are so extensive that they are the dominant structural
element over half of Mars's surface. (And just to be sure,
"half" by itself in running text is always a word.)
A nanosecond is one-billionth of a second.
Inside the UP are three 16-bit registers. (When you have two separate
numerical values side by side, one has to be a word, and the other a
numeral. Styles vary here, but make the numeral the higher number. Contrast
with the next example.)
Data from the frequency counter take the form of 16 seven-bit ASCII words.
Sales of batteries have increased from $510 million on the average during
1957-1959 to $867 million in 1966 and are projected to exceed $1.8 billion
in 1980.
The speed of light is roughly 300 million meters per second.
Fifty-three representatives of different software development companies
showed up at the meeting. (Never start a sentence with a numeral in any
writing context. With this example, some rewriting might be a wise idea to
get the numerical out of the beginning of the sentence, as in the following
rewrite.)
At the meeting, 53 representatives of different software development
companies showed up.
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