Reading Magnifier, 60mm, 20cm Focal Length Subcategory_Test Strips and three cast iron support

and three cast iron support rings for ring-stand assemblies

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

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

10-inch vacuum pump plate on an aluminum base with a stopcock and rubber seal

three interchangeable scales

Reading Magnifier, 60mm, 20cm Focal Length Subcategory_Test Strips and three cast iron supportChrome 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.