[7] Thurston. Friction and Lost Work in Machinery.
[8] Philosophical Transactions, 1877, Vol. CLXVII., p. 502.
[9] The Horological Journal, Apr., 1881. Vol. XXIII., page 98.
[10] The writer has italicised this phrase.
CHAPTER IV.
APPLICATION OF THE LAW OF FRICTION AND LUBRICATION IN HOROLOGY.
45. The scope of this work will not permit the discussion of the proper size, shape and construction of each and every part of all the various kinds of time-keeping mechanisms which have been produced. However a number of representative cases of friction and lubrication will be considered, and the laws applying to the same will be demonstrated. Practical methods of obtaining the best results will be shown and mistakes to be avoided will be pointed out.
The knowledge of what we ought not to do is sometimes of vastly greater importance than it is usually considered to be.