The Horolovar 400-Day Clock Repair Guide

167 pp. "The purpose of this repair guide is (1) to assist the repairman in determining quickly and simply the proper strength Horolovar Temperature Compensating Suspension Spring to use in repairing almost any 400-day clock, (2) to show, when possible, the correct position in which the blocks and fork should be attached to the suspension spring, (3) to explain in detail the operation and adjustment of the 400-day clock escapement, and (4) to answer the many questions which repairmen have so often asked about repair of the clock."--Foreword