Sammy's slipway or I'd never noticed

I've often wondered how Martin Samuelson launched his ships from Sammy's Point. The River Hull is too narrow to launch them bow or stern first and a sideways launch, as was done into the River Hull at Beverley, seems equally problematic in terms of river traffic and side wash. Films of this at the Beverley launches show the wave going over the opposite bank of the river. Certainly at high water the possibility of water spilling into Hull might have been seen as a problem as the images of the ships indicate they were not small.

The River Hull seems too narrow here to launch ships lengthwise. (Photo Chris Coulson)

Although I've looked at the 1882 map (Peck & Son 1882. Personal resource of Chris Coulson) many times it wasn't until I'd enlarged it that I noticed there are north/south lines in Samuelson's ship yard. The enlargement is shown below. On the original it also took a hand lens as well as concentration to see that these lines were labelled 'Patent Slip'. So perhaps Samuelson's yard had a slipway into the Humber.

The'north/south' lines have the word Patent Slip on them (Peck & Son 1882. Personal resource of Chris Coulson)

In the photo of Sammy's point in 1993 you can see two lines of posts running up from the Humber to where the ship yard would have been. There also looks to have been a channel running between them. Are these the remains of the Samuelson's Patent Slip(way)?

Sammy's Point in 1993. Cleared for development. The two lines of posts running from the Humber towards the yard can be seen just below the white car. (Courtesy Geograph.Org. UK)

It seems very likely so. One photo graph shows men apparently clearing the bottom end of the slipway. The presence of the large training ship, apparently the Sovereign, would date the photo to pre 1912.

The three men in the photo could be clearing the lower part of the slip way from Samuelson's ship yard apparently pre 1912. (Photo from Face Book 'Hull The good old days'.)

The other photo of a drawing shows ship(s) ready or being launched from Samuelson's Dock Yard . What is interesting in this photo is the number of ships which might suggest more slipways or it is quite possible that some of these vessels were partly out of the water for maintenance and not being built.

A rather interesting sketch of launch of vessels from Samuelson's yard. The nearest three vessels appear not to be in the actual yard (Image from Face Book. 'Hull the good old days.)

Google earth image of the Deep

What is interesting and bears more investigation, is the southern end of mid line of the oblong of grey building (the business centre) is 545 feet from the western point of Sammy's point and this distance to the centre of the slip way on the Peck and Sons map is 550 feet. This begs the question -- were these building built along the line of the old Patent Slip?