The Horolovar Collection Online

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The Horolovar Collection, a Comprehensive History and Catalogue of 400-DAY CLOCKS (1880-1912) was written by Charles Terwilliger and published in 1962. The designation of a clock as part of “The Horolovar Collection” has taken on some mystique over the years. And to this day, people will refer to a 400-Day clock by it’s number in the published work (1-52). Not to diminish this practice, but it’s important to remember that while these clocks come with some very distinguishing features, they were frankly, just clocks in the personal collection of Charles Terwilliger.
This becomes very clear when you read A History of the Horolovar Collection by Mun Chor Weng (published on this site) . There Mun Chor Weng describes the book’s contents and relates a discussion with Mr. Terwilliger’s son, Robert.

“While the book was in preparation, Terwilliger had some discussions with Earl Strickler who was a very early member of the NAWCC. He lived in Columbia PA where he operated a small museum in the basement of his home which he called “The Columbia Museum of Antiquities”. The two made what was to be a win-win arrangement. After the clocks had been photographed and described they were to be sent to Columbia where Earl would be happy to have them for display in his museum. At the same time Terwilliger would have a secure place to store them.
An additional benefit of this arrangement is that by the time the book and Henry Fried’s review were published the clocks were in fact “on loan to the Columbia Museum of Antiquities” Columbia Pennsylvania, Earl T. Strickler, Curator. Thus adding a note of prestige to the collection.”

Caveat lector

It is crucial to remember that the descriptions cannot be assumed to be authoritative on the subject matter. Eric (etmb61), Moderator on the NAWCC forum put it this way:

“The Horolovar Collection is an interesting book. I own a copy myself. It’s a nice piece of history and I used it to clarify some of the errors in the repair guide, but it is not a very good reference. Terwilliger’s descriptions lack a lot of information that we have available now, and in many cases are wrong.”

Contents

This online gallery of The Horolovar Collection includes the main images from the book, along with the description and history by Charles Terwilliger. It is not the complete book contents and is not intended to be. It is simply here to be a resource for those interested in the history of the 400-Day Clock. Some descriptions reference the appendix. This does not appear on this site.

How it Works

Once you enter the gallery you’ll see all the clocks in the gallery. There you can select “Jump to Clock” for a listing of the clock numbers to move quickly to the clock you are looking for. Selecting the image of a clock will open a larger image in a new tab. Clicking “more info” will take you to an area where the clock description appears. The up arrow will take you back to the top of the page to access “Jump to Clock” if needed.

Jump to clock

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If you have any questions, please Contact Us.

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Copyright Questions:
The Horolovar Collection is in the Public Domain
For a book published before January 1, 1978, the copyright term is generally considered to be 28 years from the date of publication, with the possibility of a renewal for an additional 67 years, meaning the total copyright protection could last up to 95 years from publication. However, to maintain copyright protection beyond the initial 28 years, the copyright holder would have needed to formally renew the copyright during the 28th year of the initial term to extend protection further. If a pre-1978 book was not renewed, it would enter the public domain after the initial 28 years – in this case, after 1990.

Charles O Terwilliger, Jr.

Charles Terwilliger’s contribution to horology can best be described as innovative and colorful. Not only did he revolutionize the accuracy of the 400-Day Clock, his research and clock reproductions continue to impact the world of clock collecting to this day.

HeroesofHorology.com was established in 2025 to honor the memory of Charles O Terwilliger, Jr and the company he established, Horolovar, and to fulfill the dream of his son, Robert Terwilliger, who wished for this biography to continue on after he himself passed away.