11 
PART III. 
DISCUSSION ON RESULTS OBTAINED BY TREATING SLEEPERS. 
1 . Method of Treatment ....... 
(i) General diseussion ........ 
(ii) PoweUizing. ......... 
(iii) Treatment with small quantities of high grade Creosote . 
(iv) Treatment with Chloride of Zinc and small quantities of Creosote 
(v) Treatment with a mixture of Earth Oil and Creosote, according 
to the Full Cell Process ....... 
2. Results according to species ........ 
(i) Pinus longifoUa, ‘ Chir ’....... 
(ii) Pinus excelsa, ‘ Kad 
(iii) Dipterocarpus tuberculatus, ‘ In ’ . 
(iv) Dipterocarpus alatus, ' K.a,ny'm’ ...... 
(v) Dipterocarpus pilosus, ‘ Hollong ’ . 
(vi) Terminalia tomentosa, ‘ Sain 
(vii) Terminalia myriocarpa, ‘ Hollock ’ ..... 
(viii) Lagerstraemia parvi flora, ‘ Sida ’...... 
(ix) Artocarpus Chaplasha, ‘ Sam ’...... 
(x) Altingia excelsa, ‘ Jutili ’....... 
(xi) Magnolia Sp! ‘ Gohari Supa 
(xii) Cynometra polyandra ‘ Ping ’ ...... 
Pagi:. 
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25 
20 
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26 
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PART IV. 
CONCLUSIONS ARRIVED AT AFTER TEN YEARS OF EXPERIMENTS. 
1. General ............ 27 
2. Choice of method of treatment ........ 27 
3. Introduction of the antiseptic into the timber ...... 28 
4. Species of timber suitable for treatment ....... 28 
5. Miscellaneous points brought out by the experiments .... 29 
Appendix I. — Statement showing the average annual number and class of 
Railway sleepers purchased by Indian Rail way.s. . , 30 
Appendix II. — Detailed record of PoweUized sleepers ..... 36 
Appendix III. — Detailed record of sleepers treated with Avenarius Carbolineum 
oil .......... 40 
Appendix IV. — ‘Detailed record of sleepers treated with Chloride of Zinc and 
Green Oil or Avenarius Carbolineum .... 42 
Appendix V. — Detailed record of sleepers treated with a mixture of Solignum 
or Green Oil and Burma Oil or Liquid Fuel . . . 44 
Appendix VI. — Detailed record of sleepers treated under Pressure with Green 
Oil and Assam Earth Oil ..... .47 
Appendix VII. — Detailed record of sleepers treated by a full ceU process 
under pressure in England and America .... 49 
APPENKix HI. — Graphic curves, showing the rise and fall in prices of sle^^perg 
since 1907 ........ end. 
