waywiser

plural waywisers

1. An instrument for measuring distance travelled, such as an odometer, pedometer, perambulator, etc.

   The Emperor Rudolphus II had a curious waywiser or odometer which is attributed to Schissler.

   1902, Alice Morse Earle, Sun Dials and Roses of Yesterday

   2 more examples

   I went to see Colonel Blount, who showed me the application of the "Waywiser" to a coach, exactly measuring the miles and showing them by an index as we went along.

   1656, John Evelyn, Diary

   Therefore, Elector Augustus did all he could to promote the development of mechanical waywisers that would be able to do this work automatically.

   2009, Wolfram Dolz, “The Waywisers of Elector Augustus of Saxony and Their New Use in the Survey of Saxon Postal Roads”, in European Collections of Scientific Instruments, 1550-1750, page 44

2. An instrument for determining direction (and possibly other aspects of one's travel as well).

   THE Waywiser is an instrument whereby a man may steer himself where there is no path, or underground, in a mine; or find his way if he have lost it.

   1859, Frederick Robert Augustus Glover, The Polymeter, Or Quintant

   2 more examples

   Not being accustomed to this cruciform movement, I was not able, by the waywiser, to determine the real direction of the balloon, and on this account M. Robertson suffered to escape a considerable quantity of gas; on which we again fell till the barometer stood at 29 inches, about 50 minutes past seven.

   1832, Thomas Forster, Annals of Some Remarkable Aërial and Alpine Voyages

   The purpose of the waywiser was to enable a navigator to keep a track of a ship's location by measuring and recording the speed and direction of its journey.

   2002, Stephen Inwood, The Man Who Knew Too Much

3. figurativelyA guide; A means of determining the direction in which to proceed.

   This is the research question. This is the waywiser.

   2021, Shane Chalmers, Sundhya Pahuja, Routledge Handbook of International Law and the Humanities

   2 more examples

   We have not sought to make a treatise, but only to set up a waywiser or signpost to show the road the law is taking .

   1931, Justice of the Peace and Local Government Review, page 461

   In previous volumes we have often given a few words of help to the prospective reader, intended as a sort of waywiser to guide him through those pages not always possible to lighten by some memorable illustration .

   1974, Joseph Needham, Science and Civilisation in China, page xxxiii