Fairly large copy
There are many websites that publish pdf versions of US patents for free. You just need to know what one you're looking for.
The original files that the USPTO keeps are extremely high resolution, but they are almost always scans of paper documents. For anything that old, they are definitely scans of paper documents. They are also 2 color - no greyscale, just black & white.
Of course, US Patent Documents are public record and freely available. Those guys selling patent images on fancy paper for $10 on ebay are literally using a computer printer to print a free picture on fancy paper.