427374 © = 57 (In pocket)

GEOLOGICAL SURVEY BULLETIN 1036 PLATE 3

SECTION

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NOTES
A. Overall height of housing to be such that when lamp is in socket end of Fl. To be drilled through at slightly smaller diameter than ball. Then drilled x
lamp will not project more than *4,in. beyond lower end of housing. with °{;in. drill almost through. Care should be taken not to drill
Al. % in. ventilation hole. completely through. Then drill and tap for F4. Center of hole should = \
A2. No. 6-32 roundhead machine screw, 4 in. long, negative lamp connection, be located 1'*4, in. from end. Stop holes in part E should then be iis
long solder lug under screwhead to hold wires in place. drilled to center each opening with openings in parts D and F.
A3. Drill and tap to match socket thread. F2. %4-in. steel ball.
B. RP-12 3-watt fluorescent black-light lamp. F3. Spring.
Cl. Slip fit for 2.156-in. diameter of lamp housing. F4, No. 10-32 Allen setscrew, */, in. long.
C2. Four holes drilled to clear and countersunk for the no. 8-32 flathead F5. Four holes drilled to clear screws (F6); countersink to clear heads. ROEES:
screws. F6. Four no. 6-32 flathead machine screws, % in. long.
C3. Four no. 8-32 flathead machine screws, ¥4 in. long. F7. Drill and tap four holes to match screws H4 and holes in part H.
D1. Inside corners of all pieces to be square or relieved. G. To be freefitting in part H so piece will rotate when threaded portion of G Bir tian se GS nh ee enim Bi Kas Sa: H3. Four no. 4-40 flathead screws, % in. long; drill to clear and countersink
D2. Four holes drilled and tapped for C3. is screwed into phototube housing. B2. Same diameter as H1 and H2 of transmission unit (H1 ¥, in. deep). heads in parts Ha and Hd; drill and tap matching holes in ends of part He.
D3, Four holes drilled and tapped for FG, to match holes in part F. Gl. Turn outside diameter of G1 the full length to 1.312-0.001 in. and thread (GB Waill and comncersiuk four holed coiclear Bl: H4. Drill center of %ein. dimension (spaced as shown at J1); tap to match J3.
El. 0.375 + 0.010 in. with 36 threads per inch to within ¥%4 in. of underside of 1-750-in. El. Drill and tap four holes to match part B. H5. Three no. 6-32 flathead screws, 1 in. long; drill to clear and countersink
E2. Three square openings: 2.0312 + 0.005 in. diameter flange. E2. Drill and tap four holes to match part F (F2). part Hd for H5 screws; drill and tap part Hb to match holes H5, part Hd.
E3. No. 4-40 fillistershead screw, “4, in. long. Hi. 1.750'0.003 in. diameter. E3. Drill and tap three holes to match holes H1 and screws H6, part Ha. HG. Three no. 3-56 fillister-head screws, % in. long.
F4. Locate hole at center of 2.125-in. dimension; drill and tap for E3. Hole H2. 1.313 + 0.001 in, diameter. EA ead aril sap ‘ews atesya/tnd abit a ual cocrewa 7; paceiies H7. Two no. 6-32 flathead screws, % in. long; clear and countersink two
should be located so that E3 strikes "Y” of part F at the same instant H3. Four holes drilled to clear no. 6 screws (H4); countersink for heads on Bil: ‘Same iawi@l, of teansiniaaioa naie(oteamle diameter. 2% aja holes on part Hb.
F2 stopball seats in E5. bottom side. F2. Same as Bl- HB. See Fl, 2, 3, and 4 of transmission unit.
E5. Three stop holes. Hé4. Four no. 6-32 flathead machine screws, lin. long, to match holes F7 G1. 0.2977 0.005 in. H9. Two no. 3-56 flathead screws, % in. long; drill to clear and countersink
EE. Hole for this part centered on 2.125-in, dimension of part E, but located in part F. G2.<See Ho af cranamieaioa inte: part He; drill and tap for same in part Ha.
5/4, in. down from top surface of E so that face of "4, in. diameter ex- Il. No. 4-40 Allen setscrew, ¥ in. long. Gas See RS icf cananiesicn, wile: H10. To clear 1*/,-in. dimension of part Hb.
tends above top surface of E and strikes face of part D, stopping slide 12. Drill and tap for 11; counterdrill to clear outside diameter of screw % in. (GA: Sane uaEA of teanawiasion att, caper head’ ohaccen. staan terme of H11. Length adjusted to keep 2.125-1n. dimension parallel.
at point where stopball (F2) drops in front stop hole. Following above deep. bac IsaUaces Dain: Ha
dimensions will locate EE so it will clear surface "X” of part F. 13. 154, in. diameter, 36 threads per inch to match threaded part Gl. Gs: See EScob wag amisaton' unite Hb}7°A¢ in. long.
EE1. No. 10-32, *4g in. long (threaded hole to match). 14. *{, in. shoulder, */, in. diameter. GG. See EE and E1 of transmission unit, except hole in part G is centered. Hd. - oe
: ee oe . : 3 oe 3 Jl. Four holes; drill and countersink to clear J3.
8 PET LE F001 SERS ESAS NE eager ieee eee ae OE Cea nme peer tena Contact between parts E and G to be lapped to form light-tight and free- J2. Approximately 2/4, in. on center, Center on G-in. dimension and from
sliding fit. parts Ha, b, c, and d when assembled.

J3. Four no. 10-32 flathead screws, 4 in. long.

Parts C and G of brass; all other parts of aluminum. Screws of any suitable
dimen- material.

Hl. Three holes drilled to clear H6; counterbore to clear heads % it
H2. This dimension to be flush co within 0.010 in. below top of %i
sion of part Ha.

COMPONENT PARTS OF TRANSMISSION UNIT COMPONENT PARTS OF REFLECTION UNIT
SEPARATION DRAWINGS OF TRANSMISSION AND REFLECTION UNITS