On a broken stone surface, upon a bottoming of concrete,
formed of Parker's cement and gravel 46
The following statement relates to the force required to draw a
coach weighing 18 cwt. exclusive of seven passengers, up roads of
various inclinations:
Inclination; Force required at six miles per hour; Force at
eight miles per hour; Force at ten miles per hour
lbs lbs lbs
1 in 20 268 296 318
1 in 26 213 219 225
1 in 30 165 196 200
1 in 40 160 166 172
1 in 600 111 120 128
303. In establishing a new manufactory, the time in which the
goods produced can be brought to market and the returns be
realized, should be thoroughly considered, as well as the time
the new article will take to supersede those already in use. If
it is destroyed in using, the new produce will be much more
easily introduced. Steel pens readily took the place of quills;
and a new form of pen would, if it possessed any advantage, as
easily supersede the present one. A new lock, however secure, and
however cheap, would not so readily make its way.
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