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Its bobbin had to be inserted into a bobbin case, then the case was inserted into the machine vertically to the left of the needle.When threading the needle it had to be threaded from left to right.The Singer 28K was small at only 12-1/2" bed size and had its bobbin winder located high-up near the hand wheel. Singer 127K sewing machine was very similar to the 28K.But the 127K was manufactured years later at around 1912.
When the machine was running it most likely was quite noisy because the shuttle moved forward and backwards at great speed, at times it made the machine vibrate.
The machine in the image had a small type stitch length, later varieties had the stitch length lever protruding out from a large round numbered disc.