4 
HARMONIC ANALYSIS AND PREDICTION OF TIDES 307 
Table 37.—U. S. Coast and Geodetic Survey tide-predicting machine No. 2 
GENERAL GEARS AND CONNECTING SHAFTS 
Face Number Period 
Gears and Shafts or of Pitch of Remarks 
diameter| teeth rotation 
Dial 
Inches hours 
Sa eee OMS Greta see Ee 4 | Hand crank shaft for operating machine. 
GN a 0. 56 40 24 4 | Spur gear on shaft 1. 
GaDHneemetes int 0. 50 120 24 12 | Spur-stud gear. 
(Ga ee Sos 0. 50 120 24 12 | Spur gear on shaft 2. 
Saver ses aya OO ise Ae eee 12 | Short horizontal shaft. 
Gut Saas 0. 41 72 24 12 | Bevel gear on shaft 2. 
(Cb eee 0. 41 72 24 12 | Bevel gear on shaft 3. 
Si8). 3 eee See OV50R Renken ere ts 12 | Diagonal shaft connecting with middle section. 
Gao ees so ee Lou 0. 38 75 30 12 | Bevel gear on shaft 3. 
(Gi uanses eae 0. 38 75 30 12 | Bevel gear on shaft 4. 
Se Aired neo ONSSaleeeetoncea sonra os 12 | Short vertical shaft through desk top. 
(Gh See S Ree eee 0. 38 75 30 12 | Bevel gear on shaft 4. 
Gao 0. 38 75 30 12 | Bevel gear on shaft 5. 
Sie are aaa OF38n [Sao 2 ees ee 12 | Short horizontal shaft. 
GAO ee es 0. 27 75 30 12 | Bevel gear on shaft 5. 
Gale 0. 27 75 30 12 | Bevel gear on shaft 6. 
Se Obeee eee OSSS |Z ateeee a era os 12 | Main vertical shaft of dial case. 
GAO Se: 0.17 60 48 12 | Releasable bevel gear on shaft 6. 
Ge13 8 eee 0.17 120 48 24 | Bevel gear on shaft 7. 
S27 eae ee (Albi Bee ee eee ee 24 | Intermediate shaft to hour hand. 
0.17 84 48 24 | Bevel gear on shaft 7. 
0.17 84 48 24 | Bevel gear on shaft 8. 
OGU SE East ees ea ere a 24 | Hour-hand shaft. 
0.17 180 48 12 | Releasable bevel gear on shaft 6. 
0.17 60 48 4 | Bevel gear on shaft 9. 
CO) Hay) fete eras |e 4 | Intermediate shaft to minute hand. 
0.17 240 48 4 | Bevel gear on shaft 9. 
0.17 60 48 1 | Bevel gear on shaft 10. 
O15 Boke Weis 3) eee 1 | Minute-hand shaft. 
0.17 60 48 12 | Releasable bevel gear on shaft 6. 
0.17 120 48 24 | Bevel gear on shaft 11. 
CO) TNS [pees sete Ns ee 24 | Intermediate shaft to day dial. 
2 se yp Fe es es 24 | Worm screw, 0.56 inch diameter, 18 threads to 
inch on shaft 11. 
(CRORE PEs See) eens Soaps B66RlEse 3-28 24366 | Worm wheel, 6.47 inch diameter, on shaft 12. 
Saloes=s5 22-2 See COS | i ete 2 Ss 24366 | Day dial shaft. 
0. 25 46 40 12 | Spur gear at top of shaft 6. 
0. 25 60 AQ) || Maoaes ease Spur-stud gear. 
0. 25 60 AQ is ee ce Spur-stud gear connected with gear 25 by 
ratchet wheel and pawl. 
0. 25 46 40 12 | Spur gear at lower end of feeding roller. 
0. 41 72 24 12 ,; Bevel gear on shaft 3. 
0. 41 72 24 12 | Bevel gear on shaft 13. 
Ase ee ee 12 | Main vertical shaft of middle section. 
0. 38 110 30 12 | Spur gear on shaft 13. 
0. 38 110 30 12 | Spur stud gear. 
0. 38 110 30 12 | Spur stud gear on shaft 14. 
2383] see eeee eel hase eer 12 | Front vertical shaft of rear section. 
0. 28 75 30 12 | Bevel gear on shaft 14. 
0. 28 75 30 12 | Bevel gear on shaft 15. 
O50 R Sac Sew ees 12 Mein connecting horizontal shaft of rear sec- 
ion. 
0. 28 75 30 12 | Bevel gear on shaft 15. 
0. 28 75 30 12 | Bevel gear on shaft 16. 
ONS SH ees Ses 12 | Rear vertical shaft of rear section. 
