22 Instruct io7is to Field Parties. 



Outfit for work. — Tlie outfit for field work consists of the followiiij;: 



Soil auger, 40-inch handle. 



Geologist's hammer. 



Notebooks. 



Compass or plane table. 



Odometer. 



Chain scale. 



Set of colored pencils. 



Base map. 



Sacks and tags for collecting samples of soil. 



Cards for reporting samples collected (Forms 46, 47, 48). 



Copy of Field Instructions. 

 In addition to the above certain parties should add: 



Alkali outfit. 



Extension auger and pipe wrenches. 



Filter pump. 



Metallic tape 50 feet long. 

 These supplies are to be obtained on application to the property 

 clsrk of the Bureau, countersigned by the chief clerk. Memoran- 

 dum receipts are taken by him for all supplies issued. Additional 

 supplies, stationery, etc., needed while in the field are to be ordered 

 on card, Form 43. The loss of, or damage to, any supplies should 

 be at once reported to the chief clerk, with an explanation of the 

 cause of such loss or damage. 



Odometer. — The Bell odometer has been adopted for use in all 

 measurements. The instrument should be clamped to the axle of 

 the vehicle by the band wdiich supports the shafts. The iron pin 

 is driven in the end of the hub and is bent so that as the wheel 

 revolves the end of the pin just strikes the swell of the cogwheel 

 on the odometer. If the instrument is carefully adjusted very little 

 trouble is experienced in its use. The red hand revolves once 

 every mile, giving the fractions of a mile, each space representing 

 one-fortieth of a mile, or 8 rods. Each revolution of the red hand 

 moves the yellow hand one space, representing the miles up to 40 

 in one revolution around the dial, and shown by the inside figures. 

 Each revolution of the yellow hand moves the black hand one 

 space, each space representing 40 miles, and shown by the outside 

 figures. The sum of the indications of the three hands gives the 



