CD software developed by horologist Ron Hoppes is compatible with Excel 97 and Excel 2007. Calculates Pendulum length for any beat rate, Compound pendulum rate from entered weights and dimensions, Optimal mainspring length from barrel, arbor and spring thickness measurements, Number of barrel revolutions from fully wound to unwound, Running time between windings, Barrel revolutions and running time for changes in spring length, Beats/hour based on gear tooth counts for theeentire train, Change in driving power and running time for changes in spring thickness. Instructions included. Enter the required measurements and results are displayed instantly.

Reprint of original 1937 publication. Covers, materials, layout, cutting, profiles, terms, pitch, hobbing, feeds & speeds, measuring, cutting oils, tables for indexing, worm gears, burnishing, lapping, grinding, heat-treating, and other methods. Great detail with many illustrations. Soft cover. 344 pages.

A practical manual on cleaning, repairing & adjusting. Addresses tools, materials and processes in clockwork. Originally published in 1889, most of the information is applicable & valuable today. Includes chapters on mainsprings, striking mechanisms, suspensions, escapements, escape wheels, pinions, clicks, crutches, pallets, French & German & English clocks, bench vices, drill stock, lathes, etc. Over 100 illustrations. Soft cover. 159 pages.

Reprint of 1921 publication. Includes definitions of terms, proportion tables. worm & bevel gear proportions & calculations, cutting & milling techniques, hobbing, back-cutting, shaping, etc. Invaluable fully illustrated texbook. Soft cover. 48 pages.

Discusses troubleshooting, repair and cleaning. Perfect for beginners. 48 illustrations. 124 pages. Soft cover. Published in 1972.

Covers all clocks including 400-day and early electric and battery clocks. Information on refinishing and restoration of cases. 502 pages. Hard cover. Published in 1997.