Published by
The Horolovar Company

Copyright © The Horolovar Company
used with permission

The Horolovar 400-Day Clock Suspension Spring Guide
By Charles Terwilliger

The first edition of what was to become
The Horolovar 400-Day Clock Repair Guide

The Horolovar 400-Day Clock Repair Guide
By Charles Terwilliger
1954 - 2nd edition

The 2nd edition included Henry Fried's discussion of the dead beat escapement - which was expanded in the 3rd edition - Sept 1956.

The Horolovar 400-Day Clock Repair Guide
By Charles Terwilliger

The 8th edition, published in April 1978.

It was the thirteenth printing which brought the copies in print to over 50,000 copies.

...the largest selling repair book ever devoted to one type of clock.

Victor Tang of Singapore has prepared some pages illustrating
Victor has some fascinating pages of his own - many about 400-Day Clocks. Go to Past Times and do some exploring.

The Horolovar Collection 
Limited Edition
by Charles Terwilliger

A Comprehensive History and Catalogue of  400-Day Clocks (1880-1912). Picture Collection of 52 rare 400-Day clocks. This is a limited edition of 1000 copies. A "must-have" for any serious 400-Day Clock collector.

A Review by Henry B. Fried
See The Horolovar Collection

Horolovar 400-Day Clock Repair Guide
1984 - 9th Edition
Author: Charles Terwilliger
Editors: Robert Terwilliger, Gene Waggaman
Escapement Section: Henry B. Fried
Photography: Charles Terwilliger, Peter Ireland
Design: John Harrington

Publisher: The Horolovar Company
ISBN: 0-916316-04-1
Library of Congress Catalog Card Number 83-81592

The 400-Day Clock Repair Guide (10th Edition)
By Charles Terwilliger,
Edited by Bill Ellison

Repair tips, identification guide, parts lists, trouble shooting and more. 237 pages, hard cover. 10th edition(latest). If you are doing any 400 day clock repair, this book is a must have.

Published by
Clock Trade Enterprises

"Dutch Antique Domestic Clocks, ca. 1670-1870 and some related examples"
By Dr. J.L. Sellink.

Bronxville; Clock Trade Enterprises: 1973.
Edition limited to 1000 copies.

A heavily illustrated study of Dutch domestic clocks, based on the collection in the Oegstgeest Museum of Clocks. Clocks are fully described and grouped by locality, and within those divisions in roughly chronological order. In almost all cases both cases and movements are illustrated; there are also some reproductions of period paintings of Dutch interiors showing clocks. A weighty but not ponderous volume- indeed, it moves brightly through its subject like a horologically-obsessed Keebler elf. Hardcover. 8"x11", 367 pages, hundreds of black & white illustrations, dust jacket; bibliography.

    The clockmakers' buying guide   (1976)

"A where-to-buy-it directory. The GUIDE lists hundreds of resources for parts and services for clockmakers."

The guide was not a success and was eventually sold to the American Watchmaker's Institiute.

A Century of Fine Carriage Clocks
By Joseph Fanelli
Edited by Charles Terwilliger

Published by Clock Trade Enterprises 1987 Bronxville.

This impressive volume features one hundred examples of the most sought-after carriage clocks in this country that are still in private collections, each beautifully photographed in color. Often several views of a clock are given to show parts of the case, fine engraving, enameling or other features in greater detail. There is a description of each clock and its special features, including country of origin, approximate age, style of case and type of movement/The clocks are chiefly French, but there is good representation of carriage clocks made in England, Switzerland and Austria