3181. There would be no difficulty about that. I suppose? -----
Not the slightest.
3182. What is the greatest ascending gradient in the north tube?---- (Plan handed to Witness.)
The Chairman : Shall we mark this K 3? The others will be K 1 and K 2. This will be put in. Mr Gattie.
Mr. W. H. Gattie : Certainly, Sir.
3183. I asked you to say what is the greatest ascending gradient on the northern tubes? --- 1 in 75. This is the main northern tube, and it shows the section from the Midland Railway which we will call E to C. At B we have seen its branches. That shows the branch ; that has a gradient of 1 in 93.
3184. What is the gradient shown on the line entering into the Clearing House on the North loop line? ----It is shown here as 1 in 32, but I have had to guess the level of the Midland Railway at that point because, although I have applied for the information as to the level there, it has not been forthcoming. I have taken it at its worst. I have assumed that the Midland Railway is at the same level there as it is where It crosses under the Metropolitan. Of course, that is not so, it rises considerably, it will probably be found that the gradient, instead of being 1 in 32, is approximately level.
3185. Taking the curves of your northern tube, what is the smallest curve? --- 528 feet, 8 chains. (One chain = 66 feet)
3186. What is the minimum on the northern loop? --- We call these little pieces the North loop and the south loop. On the North loop the minimum radius is 572 feet.
3187. What are the letters of that line? --- D to F is the northern loop. I want to deal with the southern tubes for a moment. These two sections here represent the outgoing lines; here we have descending gradients of 1 in 30 and 1 in 36. There is no objection to that on a descending gradient.
This is a section of the southern tube from J to H. (Producing plan.) We will call this K 1.
3188. Mark it as and bit to the other plan? --- The line starts on a gradient of 1 in 50, which at this point becomes 1 in 38 down a short piece of level then 1 in 29 up, where it it joins the 1 in 45 up on the South Eastern and Chatham. I can amplify that if necessary. It may be a contention that 2 in 29 is rather to steep----
3189. I should leave that till the question arises. What is the minimum curvature on that line? --- The minimum curvature there is about 500 feet.
3290. I should like you to refresh your memory on that ; it is not what I have got? --- There is a typographical mistake where the curvature of the southern loop is given ; it is in the neighbourhood of 600 feet. The curvature on the southern loop at the very worst part here is 352 feet ; but it is a very short piece.
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