Excerpt from A Rudimentary Treatise on Clocks and Watches and Bells Before considering the construction of horological machines it is desirable to understand what it is they have to measure. It is easy to reply, days and their subdivisions. But there are various kinds of days, all meaning one rotation of the earth, with reference to the stars, or the equinoctial point r, or the sun, or an imaginary sun going with the average speed of the real sun in its apparent annual motion round the earth. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.