2024 Reprint of the 1950 Edition. Full facsimile of the original edition and not reproduced with Optical Recognition Software. In 1938 Louis and Samuel Levin published the first edition of Practical Benchwork for Horologists, which they considered essential for all horologists. The book contained hundreds of drawings and photographs, most of which were produced by the Levins. Starting in the early 1930's, Louis and Samuel Levin started manufacturing a number of high quality jewelers' tools and the two men were active in research which produced the watch rate recorder. The Los Angeles Times reported that "when Howard Hughes was assembling his navigational instruments for his recent world-girdling flight, he sent Lieut. Thomas Thurlow, one of the navigators, to the Levins for a special sextant." By that, Louis and Samuel Levin had become very well known for their engineering, technical design capability, manufacturing skills and their extremely high quality of workmanship. Their services were sought for the repair and service of rare timepieces as well as entire watch collections. They were also employed to maintain, service and regulate the clocks used to drive the 100 inch telescope atop Mount Wilson in the San Gabriel Mountains of Southern California. Includes hundreds of detailed illustrations and photographs.