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4|" 180 C. L,. BERGER & SONS. BOSTON MONITOR TYPE Transit. With Compass. Cylindrical Pivots to telescope axis. Wye- Bearings. This Monitor Type transit has been designed to meet a demand for a lighter instrument than size No. 5>^ Monitor Transit. The same general description of our No. 5H Monitor Transit, page 166, applies to this No. 4:}^ Type with the exception that vernier B is single, which enables US to place an unusually long, sensitive and fully protected front plate level 011 this small transit and does not project over the vernier plate. We do not furnish a double B vernier. On just this one feature alone this type With the double A vernier and the single B vernier is destined to supersede the regular types made, as it lessens the tendency toward errors. In general practice a reading: on a Berg'er transit is at once accurate and sufficient. However, if the A and B double verniers are wanted we advise ordering No. 4^ transit on page 179. The outer or contra clockwise row of figures on the horizontal circle and the corresponding figures of the right side of vernier A can be furnished in Red but will be made to order only, see cat. page 41. <strong>Instrument</strong> stands upright in carrying case. Monitor Transit No. 4, SPECIFICATIONS : Horizontal circle 4%-inch, graduated on heavy ring of solid silver. A vernier is double. B vernier Is single reading to minutes, two rows of figures to 360 in opposite directions. Figures inclined in the directions verniers should be read : Verniers at 35 to line of sight. Vertical Arc 4-inch, graduated on solid silver, double verniers, reading to minutes. l Telescope 8-inch, objects erect,* aperture l /& inch, power 19 diameter. Stadia wires, fixed, in ratio 1 : 10O. Spirit level 4-inch with clamp and tangent screw to telescope. Plate levels both of standard length and very sensitive. Magnetic needle 2fi inch edge-bar form having no index error. Shifting center, to set instrument exactly over a given point. Punch mark on top of telescope, to enable to center the transit from a point above. Transit leather finished. Extension tripod. t The Mahogany case has a leather strap, hooks, etc. It contains a sun-shade, a wrench, a screwdriver, an adjustable plumb-bob, a magnifying glass, an adjusting pin, and weighs about 4 Ibs. Weight of transit about Q% Ibs. ; \veight of extension tripod about 9 Ibs. Gross weight of transit packed securely for shipment in two boxes, about 50 Ibs. Code word Geminol. Price $1 Monitor Transit No. 4V as above, but with 4" full Vertical circle and aluminum guard in place of arc. Codeword Genony. Price Extras to Transit No. Gradienter attachment Variation plate to set off all declinations E. or W. Prism and colored glass (plain form only permissible, Fig. 7, page 175) Reflector for illuminating the cross wires Short focug lens, pages 101, 203, one Edge graduation for vertical circle, with a double vernier at eye end, page 198 Edge graduation for vertical circle, with double opposite verniers, page 198 Patent interchangeable auxiliary teles'cope, style I, page 189 Berger solar attachment with small telescope, page 172 Split-leg tripod in addition to extension tripod furnished with the transit . Bracket in box, page 203 Trivets, page 204 .... Lateral adjuster, page 205 . Leather cover with shoulder " straps without Hood to protect transit from rain and dust , Bottle of fine watch oil . * 5.00 10.00 8.00 4.00 8.50 35.00 45.00 37.0O 58.00 16.50 14.00 25.00 13.00 11.00 1.00 .35 *An Inverting Telescope of l'/8 " aperture, TtVa" long, power 18 dia. can be supplied with the above transit in place of the regular erecting one at no additional cost. This telescope is particularly well adapted for stadia work. Made to order only. t We furnish with this instrument a heavy extension tripod, such as furnished with transit size No. 2. This secures to the transit the necessary great rigidity and stability. However, when required, we can furnish an extension tripod weighing 7 Ibs. only (price being the same), in place of the 9M lb. tripod, or in addition if desired for special purposes. We can also furnish the stiffer split-leg tripod weighing only 7^4 Ibs. in place of the extension tripod. This we recommend very strongly whenever applicable.
NO. iii. at edge of graduation) 181 C. L. BEKGER & SONS. BOSTON No. 4^ Complete Monitor Type Transit F>r size and particulars of this instrument, as wi'H as for Extras, see page 18O. Code word, Geniinol Price, $248.00 Cylindrical Pivots to telescope's axis running in tlie improved adjustable Wye- Block Bearing. The center point is located on a round hub on the telescope's axis to letter distinguish it in dark places when centering under a point above the transit. The Eye-Piece Cap is large in diameter. It affords a protection to the eye of the observer in a glaring sun. It has been combined with a dust guard which fully protects the Eye-Piece focussing slide. The Front Plate Level is fully protected. Improved Leveling Head with dust caps to leveling screws. To avoid mistakes and to save time telegraph Code name.
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ENGIN. LIBRARY UC-NRLF STANDARD INS
Page 9 and 10:
PREFACE. THE instruments enumerated
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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
Page 136 and 137: 130 The Berger 18 MONITOR TYPE WYE
Page 138 and 139: 1 18 132 C. I*. BERGER & SONS, BOST
Page 140 and 141: 18 134 II ENGINEERS' WYE LEVEL. lev
Page 142 and 143: 136 18" HYDROGRAPHER'S WYE LEVEL Ha
Page 144 and 145: 138 Reversion Level. Applicable to
Page 146 and 147: 140 The Telescope will be invariabl
Page 148 and 149: 142 THE GEODETIC LEVEL. In response
Page 150 and 151: 144 COAST SURVEY PRECISE LEVEL The
Page 152 and 153: 146 PLANE TABLE This instrument, as
Page 154 and 155: 61" 150 ENGINEERS' AND SURVEYORS' T
Page 156 and 157: No. 1 a. 6 1 4 in. at edge of gradu
Page 158 and 159: No. I a. T 4 in. at edge of graduat
Page 160 and 161: No. 1 c. 154 C. L. BERGER & SO>S in
Page 162 and 163: 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 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 214 and 215: Mining Transit. Interchangeable wit
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
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230 Current Meters, The types of cu
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232 Current Meters No. V and VI, As
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234 Plain Polar Plaiiimeter. This P
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236 Leveling Rods No. 145 No. 147 N
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Paine's Steel Tape Measures. & inch
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240 Surveyors' Chain Tapes. Heavy J
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2-12 Standard Steel Tape Measures.
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No. 210. Plummet Lamp. tfo. 212. 24
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246 Portable Anemometers. These ins
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PRICES SUBJECT TO CHANGE WITHOUT NO
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J Tripod Head 2 // Bolt 3 * .* Nut
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Levels, Locke's Hand Reversion Revo
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C. Li. Berger & Sons' Bevel-Limb Tr
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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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