David,
The patent drawing does not have sharp, well defined lines and is fuzzy to my low vision.
The only think typical about his fuze is the head on view and it only has one hole vs. three. Hubbell even stole Splinegard's idea of the plaster of paris column.
Cyrus Alger's water cap fuze was invented and provided to the Federal government in the 1840s, Hubbell's patent was issued in 1862. Who copied who?
Sorry I can't help you with a decent drawing. Even Hubbell's description of operation is confusing to me in order to wing it. Notice Hubbell's eighth patent claim was for his water cap.
Joe and I have a rather large petition by Francis Alger, Cyrus's brother, which includes 1840s drawings and letters by numerous authorities, of that era, which documents Cyrus Alger's sale and approval by the Ordnance Department for his water cap fuse adapter as we know it.
Best Regards,
John