Reading Magnifier, 60mm, 20cm Focal Length Subcategory_Test Strips this 6V-maximum electromagnet supports paper-clip-load

this 6V-maximum electromagnet supports paper-clip-load measurements that reveal the linear relationship between input voltage and lifting force

and three cast iron support rings for ring-stand assemblies

Fine-gauge 24 SWG bare copper wire on a 250g reel approximating 375 feet

6mm central pinhole

and Newton's Third Law through one-dimensional elastic collisions along a 27-inch V-shaped track with five steel balls

Reading Magnifier, 60mm, 20cm Focal Length Subcategory_Test Strips this 6V-maximum electromagnet supports paper-clip-loadChrome plated 60mm reading magnifier extending to a 20cm focal length, the longer focal distance lowering magnification but broadening the visible area on a single page.