D.—l.

Table XXIV.—Elements for Saccardo Tunnel Ventilating Apparatus.

Table XXV. —Cost of Working Ventilating Apparatus for Summit Tunnels.

Table XXVI .—Comparative Annual Cost of Working, in Pounds Sterling.

76

Line. Length of Tunnel. Area of Tunnel, Crosssection. V.,* in Feet per Minute. R. S., f in Feet per Minute. Area of Outlet. Discharge per Minute. A 1 ... A 2 ... A 3 ... A 4 ... B 1 ... B2 ... B3 ... Ft. 31,680 25,941 26,337 29,373 27,777 17,952 17,952 27,952 200 200 200 200 200 200 200 200 1,500 1,500 1,500 1,500 1,500 1,500 1,500 1,500 9-7511 8-834 8-9003 9-3932 91710 7-3699 7-3699 7-3699 14,627 13,251 13,351 14,090 13,756 11,055 11,055 11,055 17-09 18-86 18-73 17-743 18-195 22-61 22-61 22-61 Cubic Feet. 250,000 250,000 250,000 250,000 250,000 250,000 250,000 250,000 * V = Velooi tS= Veloc Lty of air-eurj :ity at outlet rent in tunnel, of nozzle.

Trains per Annum in each Direction. Line. Tunnellength. 340. 477. 500. 681. 70( 340. 477. 500. I. 1,000. Coet - milis." Cost - Train-,„ t Train- r t Train- „ . Train- „ ,. Trainmiles. t,ost - miles. cost - miles. Cost - miles. Oost - miles. Miles. 6-0 Time running Time standing Cost of working Time running Time standing 4,080 20,920 3,341 21,659! £ 287-4; 5,724 444-5J19.276, 731-9 .. '235-2; 4,687 '460 20,313 ,695-2 .. 238-5 ! 4,759 459 20,241 £ 403-1 410-0 818-1 330-1 431-9 6,000 19,000 4,913 20,087 £ 422-5 404-0 826-5 345-5 427 8,172 16,828 6,692 18,308 £ 1575-4 1357-6 933-0 1471 1389 8,400 16,600 6,878 18,122 £ 591-6 353 944-6 484 384-5 12,000 13,000 9,826 15,174 £ 845'1 276-2 1,131-8 692 323 A 1 4-913 Cost of working Time running Time standing 3,392 21,608 762 335 430 4,988 20,012 772-5 351 425 6,794 18,206 860 : 478-5 1387 6,983 18,017 868-5 492 383 875 9,976 15,024 1,015 702 319 A 2 4-988 Cost of working 697-5 .. 765 776 865-5 1,021 A 3 5-563 Time running Time standing 3,783 21,217 266-4 5,307 451 19,693 373-5 418-5 5,563 19,437 392 413 7,577 17,423 533 370 7,788 17,212 548 365-5 11,126 13,874 785 295 Cost of working 714-4 .. 792-0 805 903 913-5 1,080 A4 5-30 Time running Time standing : 3,604 ! 121,396, ! 253-5 5,056 ,454-519,944 355 324 5,300 19,700 373 418-5 7,218 17,782 507 378 7,420 17,580 522 374 10,600 14,400 746 306 Cost of working Time running Time standing 2,310 ;22,690 708-0 .. 162-7 3,240 482-0 21,760 779 228-2 462 3,400 21,600 791-5 239-5 459 4,640 20,360 885 326-5 433-0 4,760 20,240 896 335 430 6,800 18,200 1,052 479 386-5 Bl, B2, 3-40 B3 Cost of working 644-7 .. 690-2 698-5 759-5 765 865-5

Item. Line A. Line A 1. j Line A 2. Line A 3. ; Line A 4. Line B 1. Line B 2. j Line B 3. 500 Trains each Way. lotive power Renewals and repairs to oars laintenanoe of way r entilation of summit tunnel Total .. 1387-75 1447-45 1429-3 i 1427-05 166 182-5 J 175-5 170 .. 1865-5 1762 1759 1819-5 826-5 772-5 776 805 .. 4245-75 4164-45 4139-8 ! 4221-55 1408-7 163 i 1771-5 791-5 1573 217-5 1741-5 698-5 1574-6 220-5 1726-5 698-5 1585-85 I 225 1774 698-5 ! 4134-7 4230-5 4220-1 4283-35 700 Trains bach Way. 1758-48 228-2 2480-1 896 1988-81 304-5 2438-1 765 1991-64 308-7 2417-1 i 765 2007-79 315 i 2483-6 ' 765 lotive power lenewals and repairs to oars laintenanoe of way 'entilation of summit tunnel Total .. 1729-45 1812-93 ! 1787-32 I 1783-87 232-4 255-5 I 245-7 I 238 .. 2611-7 2466-8 j 2462-6 2547-3 944-6 868-5 I 875 913-5 .. 5518-15 5403-73 I 5370-62 5482-67 5362-78 5496-41 5482-44 ! I 5571-39