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Mining Transit. Interchangeable with Lamp Targets above Leveling Screws. Telescope is mounted on standards as shown in cut of No. 3, with a double vernier between the legs of the standard, and is provided with a striding level, see cut, page 156. Compass Needle 3 3 /i inch. The leading feature possessed by this instrument, as made by us, is that it can be interchanged with the lamp targets above the leveling screws (see opposite page) so that after they have been set up their relative position as to height and location will remain exactly the same upon being transferred from one tripod to another. It is an instrument especially adapted to the work of an engineer in mines, and as such involves a great deal of apparatus not possessed by instruments intended for surface work. Two lamp targets are commonly supplied with an instrument of this kind, but frequently one only is ordered, according' to the character of the work for which it is intended. The vertical centers of the lamp targets have to be well fitted into the sockets of the leveling heads, and in consequence they cannot be furnished separately. The engineer will therefore decide whether one or two lamp targets are necessary for this work. The lamp targets are of the same height as the transit measured from the base above the leveling screws to the line of sight, and each is provided with two spirit levels. The targets can be revolved in the vertical and horizontal planes. By means of a tubular sight, situated on top of the target, the latter can be readily set in the direction of the instrument so that its face will lie at right angles to the line of sight. The lamps can be raised or lowered at will, and can be detached whenever necessary. It is of the bull's-eye pattern, and the best lard-oil only should be burned in it. A disc of milk-glass placed between it and the target furnishes an illuminated background, against which the intersection and outlines of the target are seen sharply denned. Made to order Qnly> Weight of Mining Transit No. 7, about 11 Ibs. one " lamp, Mahogany box containing instrument and one " lamp, target, etc., about 32 one Extension Tripod, about 9 J Ibs.; two " " Tripods, 19 Gross weight of instrument, complete, packed securely for shipment in 2 boxes, about 70 Ibs. Ibs. " S-aJ " |51 three " . Tripods, ... 28* " alt \ Gross weight of instrument, complete, packed securely for shipment in 3 boxes, about 120 Ibs. | [ Weight of Mahogany box, containing instrument only, about . . . . 22 " " " 2 " lamps, targets, etc., .... 26 No. 7 Mining Transit, size as in Transit No. 6, but with one lamp target as shown on opposite page; graduations on solid silver; verniers reading to minutes are provided with ground-glass shades; 5-inch full vertical circle; aluminum guard; spirit level, clamp and gradienter screw to telescope; illuminator shade; striding level and fixed stadia wires, telescope mounted as shown on page 156, 2 extension tripods, 2 plumb bobs, etc. Lamp target packed in instrument-box. Price, $38O.OO No. 7a. Mining Transit, as above, but with 2 lamp targets, both packed in separate box, 3 extension tripods, 3 plumb bobs, etc. Price, $4GO.OO Mining Transit No. 7b. with Yoke Standards. No. 7b. Mining Transit, as shown hi cut, with yoke standards, compass with 2^-inch needle; 5-inch fully protected vertical circle with face graduation; double opposite verniers reading to minutes, glass covered; interchangeable auxiliary telescope, Style I; striding level; stadia wires; illuminator shade; gradienter; adjustable center for accurately centering instrument from a point above; one lamp target packed with instrument in one box; two extension tripods; two plumb bobs. Weight, size, etc., as above in Transit No. 7. Price, $492.OO No. 7b. Mining Transit, as above, but with two lamp targets both packed in separate box, three extension tripods, three plumb bobs, etc. Price, $ 572.OO For price of extra attachments, see Extras to Mining Transits, page 188. NOTE. To interchange the instrument and the lamp target proceed as follows: First withdraw the spring bolt of the lower clamp for the outer center by means of the small milled-headed nut at the end of the clamp opposite the tangent-screw. Then loosen the clamp screw immediately above the leveling head. Now upon pulling back the spring bolt, situated at the side of the clamp, the instrument or the lamp can be detached by lifting it out of the socket in the leveling head. These sockets as well as the clamps, which serve to fasten the instrument or lamp target to the leveling head, should be kept free from dirt or grit. After clamping the instrument to the leveling head, to prevent any motion in its socket, and then releasing the small milled-headed nut from its fastening on the spring bolt of the lower tangent-screw, the transit is ready for work and can be manipulated the same as other instruments of our construction. For adjustment of the transverse striding level, see page 56.
209 Mining Transit interchangeable with Lamp Targets above Leveling Screws. Lamp Targets for Transits No. 7 and No. 7b. Mining Transit No. 7b. With Yoke Standards. As made by C. L.. Berger & Song. Patented.
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ENGIN. LIBRARY UC-NRLF STANDARD INS
Page 9 and 10:
PREFACE. THE instruments enumerated
Page 11 and 12:
DESCRIPTION OP THE Essential Featur
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Tangent Screws. These are made of A
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The Finish. It is a well-known fact
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11 whatever. As a rule more harm th
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13 has sufficiently developed to im
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15 ordinary instruments, but it mus
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17 frame, and apply another drop of
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19 The finer and finest classes of
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21 applied with an adjusting pin ab
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23 adjustment of the telescope in t
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25 Owing to the many improvements m
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27 Engineers 9 Instruments and Thei
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ITrfpodfead 2 // Bolt 3 // >/ Mf J
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In practice, however, many engineer
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34 The Pancratic, or Changeable Pow
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the 130 division, and moved on unti
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38 Graduation Reading to 2O". A 15
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Decimal Vernier Graduation. For rai
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HORIZONTAL CIRCLE HORIZONTAL CIRCLE
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44 line of collimation of the teles
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46 Obviously then, the number of wh
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48 Gradienter Screw Table I. Factor
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50 The subjoined table affords a re
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52 Plumbing and Centering Arrangeme
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54 To make the adjustment for Paral
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56 capstan-headed screw at left to
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58 To adjust the line of collimatio
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62 The Adjustment of the Wye Level.
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On slightly rising ground locate fo
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(5.) Astronomical Triangle. The hei
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68 From the -(- sign of the " diffe
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70 Degree of Precision Required. (1
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72 tions for refraction, using the
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74 Correction to the Mean Refractio
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76 Table H. Coefficients showing th
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78 To Find the Meridian from " Pola
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80 REMARKS. If the instrument is no
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82 These devices are being more and
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84 c. Directions. For finding the S
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6. Directions. For reducing the nor
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88 On Stadia Measurement. Written e
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90 included between this and the ot
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92 Jug, R, of the rod AB is the dif
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94 gent screw of the main telescope
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96 zero when plates are leveled up
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i I * 2 I! all 35 e 5c u fcc - = H
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100 Berger Short Focus Lenses. A se
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102 NOTE. In selecting instruments
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RIBBING PARTS OF INSTRUMENTS. Patro
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The Berber Complete Engineers' and
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[Patented) The Berber Complete Mine
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11(5 5 O o to tO u tO CM in in in o
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118 n ai in Spirit Levels. For the
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l, 33 120
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122
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14 124 C. L,. BEKGEK & SONS. BOSTON
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1 5" AND 1 7|" C. t. BKKGER & SONS.
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C. 1-28 BEKGEU & SONS. Monitor Type
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130 The Berger 18 MONITOR TYPE WYE
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1 18 132 C. I*. BERGER & SONS, BOST
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18 134 II ENGINEERS' WYE LEVEL. lev
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136 18" HYDROGRAPHER'S WYE LEVEL Ha
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138 Reversion Level. Applicable to
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140 The Telescope will be invariabl
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142 THE GEODETIC LEVEL. In response
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144 COAST SURVEY PRECISE LEVEL The
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146 PLANE TABLE This instrument, as
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61" 150 ENGINEERS' AND SURVEYORS' T
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No. 1 a. 6 1 4 in. at edge of gradu
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No. I a. T 4 in. at edge of graduat
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No. 1 c. 154 C. L. BERGER & SO>S in
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No. 1 c, Style p. in. at edge of jr
Page 164 and 165: . 1 f. is made by C. L. Berger & So
Page 166 and 167: 160 C. L. BEKGEK & SONS. MONITOR TY
Page 168 and 169: 162 64 SURVEYORS' TRANSIT No. 1 s.
Page 170 and 171: 5^" 164 C. L. BERGER & SONS, BOSTON
Page 172 and 173: 166 C. L. BERGER & SONS. BOSTON 5|"
Page 174 and 175: 5|" 168 ENGINEERS' AND SURVEYORS' T
Page 176 and 177: The Surveyors' Solar Attachment. Pl
Page 178 and 179: 172 The Berger Solar Attachment Att
Page 180 and 181: 174 Davis' Patent Solar Attachment.
Page 182 and 183: 176 THE 5|" MOUNTAIN TRANSIT. This
Page 184 and 185: 178 The 41" Mountain and Mining: Tr
Page 186 and 187: 4|" 180 C. L,. BERGER & SONS. BOSTO
Page 188 and 189: 182 The 4" Mountain, Mining and Rec
Page 190 and 191: 184 The 4" Complete Transit- Theodo
Page 192 and 193: 186 4>4 " Complete Mine Transit No.
Page 194 and 195: ^ 188 t4 Mining Transits. All of th
Page 196 and 197: The 190 See M Fig. 1. Berger Patent
Page 198 and 199: 03 192 Complete Mining Transit No.
Page 200 and 201: |S go Complete Wet-Mine Transit No.
Page 202 and 203: 196 Different Types of Vertical Arc
Page 204 and 205: :i98 Edge G-racl nation for Vertica
Page 206 and 207: The Open-Frame Protected Vertical C
Page 208 and 209: 202 C. L. BEKGKK & SONS. Flexible J
Page 210 and 211: S fa 204 Style of trivets used with
Page 212 and 213: 200 Patented. The Lateral Adjuster
Page 216 and 217: 210 Tunnel Transits. Xo. 1C a Tunne
Page 218 and 219: 212 Triaiigulatioii Transit- Theodo
Page 220 and 221: No. lib. 214 Complete Double Opposi
Page 222 and 223: 210 No. 11 m. 7-iiich Complete Tran
Page 224 and 225: 218 No. llg, 7-inch Complete Triang
Page 226 and 227: 220 No. 12. 8-iiich Transit for Tri
Page 228 and 229: SPECIFICATIONS : No. 15 Alt-Azimuth
Page 230 and 231: No. 15 b. Alt.-Azimuth. 224 Alt. -A
Page 232 and 233: Portable Transit Instrument for Lat
Page 234 and 235: 228 Reflecting Circle. Artificial H
Page 236 and 237: 230 Current Meters, The types of cu
Page 238 and 239: 232 Current Meters No. V and VI, As
Page 240 and 241: 234 Plain Polar Plaiiimeter. This P
Page 242 and 243: 236 Leveling Rods No. 145 No. 147 N
Page 244 and 245: Paine's Steel Tape Measures. & inch
Page 246 and 247: 240 Surveyors' Chain Tapes. Heavy J
Page 248 and 249: 2-12 Standard Steel Tape Measures.
Page 250 and 251: No. 210. Plummet Lamp. tfo. 212. 24
Page 252 and 253: 246 Portable Anemometers. These ins
Page 254 and 255: PRICES SUBJECT TO CHANGE WITHOUT NO
Page 256 and 257: J Tripod Head 2 // Bolt 3 * .* Nut
Page 258 and 259: Levels, Locke's Hand Reversion Revo
Page 260 and 261: C. Li. Berger & Sons' Bevel-Limb Tr
Page 262 and 263: 0) O (^ c CL 0? Z O (0 O K lu ffi C
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O CO K III III These prices do not
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ord (In whether . 4 O ~ bJD p,"* 3,
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a -iQ. Q u u o 0) o 0) U O U CO o C
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These prices do not include bag (SI
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Q III o o z o u o o U Ott bl CD O U
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o O (0 ui y O J O Q. O U 5> OC os .
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800290 I A 33012 Engineeringlibrary
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STANDARD - Survey Instrument Antique Center!

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