Jacobs Tapers are used almost exclusively for Drill Chuck Mounting.
Morse Tapers are found in a wide variey of tooling: drill bits, reamers, end mill holders, drill chuck arbors, collets, lathe centers, etc.
Brown and Sharpe tapers are found on similar tooling, but mainly on older tools and machines. Find Morse Taper, Jacobs Taper, and Brown and Sharpe Taper dimensions below.

JACOBS     LARGE      SMALL
TAPER#    DIAMETER   DIAMETER    LENGTH
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  0        .25000"    .22844     .43750
  1        .38400     .33341     .65625
  2        .55900     .48764     .87500
2 short    .54880     .48764     .75000
  3        .81100     .74610    1.21875
  4       1.12400    1.03720    1.65625
  5       1.41300    1.31611    1.87500
  6        .67600     .62409    1.00000
 33        .62401     .56051    1.00000
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           LARGE      SMALL
MORSE     DIAMETER   DIAMETER
TAPER#      (A)        (B)       LENGTH
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  0        .35610"    .25200     1-15/16
  1        .47500     .36900     2-1/16
  2        .70000     .57200     2-1/2
  3        .93800     .77800     3-1/16
  4       1.23100    1.02000     3-7/8
4-1/2     1.50000    1.26600     4-5/16
  5       1.74800    1.47500     4-15/16
  6       2.49400    2.11600     7
  7       3.27000    2.75000     9-1/2
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           LARGE      SMALL
 B+S      DIAMETER   DIAMETER
TAPER#      (A)        (B)       LENGTH
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  1        .23922"    .20000       15/16
  2        .29968     .25000     1-3/16
  3        .37525     .31250     1-1/2
  4        .40233     .35000     1-1/4
  5        .52315     .45000     1-3/4
  
  6        .59961     .50000     2-3/8
  7        .72537     .60000     3
  8        .89873     .75000     3-9/16
  9       1.06705     .90010     4
 10       1.28927    1.04465     5-11/16
 
 11       1.53176    1.24995     6-3/4
 12       1.79681    1.50010     7-1/8
 13       2.07310    1.75005     7-3/4
 14       2.34375    2.00000     8-1/4
 15       2.61458    2.25000     8-3/4
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