DUST PREVENTION AND ROAD PRESERVATION, 1916. 
e 
41 
TaBLE 46.—Analysis of residual asphaltic petroleum} used in surface treatment of 
Bradley Lane. 
SeceiC Orly eyo toe sent care) eee ey Li Mila oe 0. 993 
MPeetic Viscosity. Engler: 100%. SOIeN Gs). SoA tee ays a ae Sas olan 13.5 
iormesh ato oO... WECONGS 24) iy Ver Mek! ¢ WINE a Gh Sh ea tee Voie 9 2° 28 
West) los 7)¢.,.oynours, 20 crams, percents.) 92k eh ysel.. 8 Isr 
ian Ob Testdnex Oo). © SeCOndse tea. = 8 aad oo ee see keer es 151 
Per cent of total bitumen insoluble in 86° B. naphtha. ..................... 18. 63 
Bemectinimred) CALDOM:: aris seis 2 (22) YAMee be Lc ekthes Saati pot Jere ss 11. 25 
Bitumen soluble in CS, (total bitumen), per cent........-....-------------- 99. 89 
Sreantie matter msoluble,. percent. 2225.62 2c ashe) ose eee ee oe . 08 
imoreainicymatter insoluble; per cent... 52. - 2.242.282 J a 03 
Bb seas Seeney sk peste ak op rane 8 ee ae yab yin fate saree et ed Ween ge aso. = 12 100. 00 
TapiE 47.— Materials and cost data for surface treatment in 1916. 
PAG GARRET LCR s Ee = cee yee ast WB ha life Hh) ili olla pfay Suvialy 
Quantity of material per square yard: _ 
PE AMNOUSIMN ALCHIAL vars se ete seer eee ape! se ee eer ewe ye 7S eto 
(HPT AYE be Se Rice mee ea Re a lhe aR 
Cost per square yard (cents): 
slat nn Si Uaalenl square yards. . 
gallons... 
pct De ae cana cubic yards. - 
FEST UPEEFERTYOELS ATTA LOLOL cyte ecloy  oys trae rat ea ae epee sie esid ote em eshele wise a onan eras Merete te eae capers 
Gre VOLE ee Ne eal o Ae SA ee ewan Mees se Ae aR et ae dp o. eens De Age 5 
SV IGAMINSISULIACOn se ner ese neler a ae ee etaree aie’ o See belcioe ei cet cere nar ajad aay Pac ste 2 
PAulinmmaterials! 922) 4) Perea sat steer) ceuae eee cate pin ct bass gates se so aes SSeS au SeC ee PERE 
PA Dlgan Sy OLLUMINOUS MALEDIAIS] a2 ous sees eee eens aise ee Seen oe eee eles = waiice eee aaeeele 
pplyinesand and Craveley. oc 2 jae Hos eee eee sk ea patos Oe ee Sas Pra Norn eee ee 
DE PORVISIOW Me tars eee see ne err coin asm ne eels ence ais Maicia SEIS Ue Oem nce tee mene enielane 
7.99 
TABLE 48.—Surface maintenance costs of 1915 experiments, Bradley Lane, Montgomery 
County, Md., from Jan. 1 to Dec. 31, 1916. 
Length of 
Uxperiment No. . Area. 
SEE Gi Construc- | Mainte- 
tion. nance. 
Feet. Sq. yards. “Cents. Cents. 
U5! as SS Le Ea os 2 3,614 6,421 32, 84 7.99 
Deepa eres witches Seadtecs 200 367 39. 42 c 
Cost per square yard. 
Mainte- 
nance cost 
Total. per mile. 
Cents. 
~40. 48 2 $684. 31 
TaBLE 49.— Volume and character of traffic on Bradley Lane, Jan. 1 to Dec. 30, 1916. 
Twenty-four-hour period. 
Maximum. Average. 
East West East West 
bound bound bound. | bound. 
Hel puoaded dt -horse wagon: o.0 a. sea epee sack eet e 11 15 6 7 
Zhwnloaded: 2-horse wagon.) 6.25 8 oe ee es PO ee 12 13 5 4 
Salcoadedse-horseiwaron est yy s sn eh en a ea 24 14 10 6 
AAmUniGad ed: 2-HOrse WagON. feos. eee e eee ee ccc ce ecu 8 18 2 6 
EOAG eM -HOrsenvacon. oon eta eee See ee A ae 3 3 1 1 
6 | Unloaded 4horse wagon..................--.------+------ 1 |}. Di) eee HS bees 
7 | One-horse pleasure vehicle................--.---.--------- 11 8 3 4 
8 | Two-horse pleasure vehicle. ..............:-..---.-------- 1 OA eee sae A eae ete 
9 | Rubber-tired horse vehicle...............--------------- 2 ay | eres ees RE eneee 
LON Saddlethorse: 5.0/6. .2) 252": Tae te ites Far eae 6 4 | 1 1 
lGie Motor cyclosen onic ~ be ier OWN Ls Siete oe see 37 42 9 10 
12 | Excessively heavy vehicle3...............-....---------- 4 4 1 1 
PTUIPNEOLOR RUMAD OE 2 nl ee ae NT oe 95 88 27 33 
Ma Motontouninecarsss.. 2 eee ies ee ae 436 493 141 160 
a SnpeOadedsmOtordray seo eee pete oe coe 35 4] 18 24 
LGM PUnloaded motor drays2s-62 20k sete see eS 10 13 4 3 
1 Viscous, sticky fluid. 2 Width of surfacing taken as 16 feet. 
8 Very heavy vehicles, such as carry ore, stone, timber, machinery, etc. 
