![In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation](https://invention.si.edu/sites/default/files/inventors-hammer-william-x-ray-demo-for-daughter-mabel-1902-si-neg-85-8778-750-inline-edit.jpg)
In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation
![James Nasmyth, 1808 - 1890. Inventor of the steam hammer (Self-portrait) | National Galleries of Scotland James Nasmyth, 1808 - 1890. Inventor of the steam hammer (Self-portrait) | National Galleries of Scotland](https://www.nationalgalleries.org/sites/default/files/styles/postcard/public/externals/120478.jpg?itok=PAxisw0v)
James Nasmyth, 1808 - 1890. Inventor of the steam hammer (Self-portrait) | National Galleries of Scotland
![In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation](https://invention.si.edu/sites/default/files/inventors-hammer-william-with-wright-flyer-nasm-9A01542-750-inline-edit.jpg)
In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation
![Nasmyth's patent steam hammer, copied by permission of the inventor from the machine in the great exhibition | Library of Congress Nasmyth's patent steam hammer, copied by permission of the inventor from the machine in the great exhibition | Library of Congress](http://tile.loc.gov/storage-services/service/pnp/cph/3c10000/3c10000/3c10400/3c10414v.jpg)
Nasmyth's patent steam hammer, copied by permission of the inventor from the machine in the great exhibition | Library of Congress
![3D Solid Modelling Videos: Handle of Tack Hammer-Autodesk Inventor 2013 (with caption and audio narration) 3D Solid Modelling Videos: Handle of Tack Hammer-Autodesk Inventor 2013 (with caption and audio narration)](http://lh6.ggpht.com/-mz-XOroF0XE/U4TBT82ybvI/AAAAAAAADNE/31n13mUSanU/Tack%252520Hammer_thumb%25255B1%25255D.jpg?imgmax=800)
3D Solid Modelling Videos: Handle of Tack Hammer-Autodesk Inventor 2013 (with caption and audio narration)
MoveFactorX - Gary Jones, the Founder & Inventor of Hammer Strength stopped over to the office for a visit today. Gary keeps a low-profile, but he is one of those true pioneering
![In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation](https://invention.si.edu/sites/default/files/styles/story_banner_image/public/inventors-hammer-william-ac0069-0000017-sepia-banner-edit.jpg?itok=tjt685UH)
In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation
![1890 Hammer Patent Artwork - Blueprint Jigsaw Puzzle by Nikki Marie Smith - Nikki Marie Smith - Artist Website 1890 Hammer Patent Artwork - Blueprint Jigsaw Puzzle by Nikki Marie Smith - Nikki Marie Smith - Artist Website](https://render.fineartamerica.com/images/rendered/default/flat/puzzle/images-medium-5/1890-hammer-patent-artwork-blueprint-nikki-marie-smith.jpg?&targetx=-43&targety=0&imagewidth=800&imageheight=1000&modelwidth=714&modelheight=1000&backgroundcolor=0D5CA2&orientation=1&producttype=puzzle-20-28&brightness=267&v=6)
1890 Hammer Patent Artwork - Blueprint Jigsaw Puzzle by Nikki Marie Smith - Nikki Marie Smith - Artist Website
![In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation](https://invention.si.edu/sites/default/files/inventors-hammer-william-ac0069-0000017-sepia-teaser-edit.jpg)
In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation
![Edward E. Hammer of Nela Park invented compact fluorescent light bulbs: news obituary - cleveland.com Edward E. Hammer of Nela Park invented compact fluorescent light bulbs: news obituary - cleveland.com](https://www.cleveland.com/resizer/WTBax3AOl8fmCinSVQp3fwc_SVg=/1280x0/smart/advancelocal-adapter-image-uploads.s3.amazonaws.com/image.cleveland.com/home/cleve-media/width2048/img/obituaries_impact/photo/edward-hammerjpg-c591a9cabf8358e6.jpg)