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1 5" AND 1 7|" C. t. BKKGER & SONS. MONITOR TYPE DUMPY LEVEL. An instrument of great precision, superior to any Wye Level of same, aperture, power of telescope, and same sensitiveness of spirit-level. The best instrument for use in distant lands and rough country on account of its great compactness, simplicity, strength to withstand rough treatment, permanency of adjustments, and steadiness in a strong wind, requiring but ordinary attention and care to keep in working order. For a fuller description, see page 128. This new type of Dumpy Level with round, hollow, and very long cross-bar, must be considered the most perfect in this line. It stands low on the tripod, and its fine spirit-level, being placed in the hollow cross-bar, below the telescope, can be read from either side, and is entirely protected from accident and liability to derangement of adjustments, also from the disturbing influences of the heat of the sun, touch of fingers, breath, etc. These latter conditions are not fulfilled in instruments where the level is placed on top or at the side of the telescope, and are frequently causes of the incorrect reading of the bubble. This instrument is of very strong build, combined with a minimum of weight, and as it consists of a fewer number of pieces than the Wye Level, is less liable to derangement in case of accident. The adjustment once properly made by the two peg method (see adjustment of Dumpy Level, page 63) is apt to stay so for years, thus removing one of the chief objections as compared with those of a Wye Level. In making the adjustment of this Dumpy Level the engineer does not depend so much on mechanical perfection, as on his own superior skill and sense of accuracy. To meet an urgent demand this type of Dumpy Level is now provided with a clamp and tangent screw to enable, in a strong wind, to keep the telescope upon an object, and, although it raises the price, it will prove an invaluable accessory, well worth the extra cost. This instrument is leather-finished. The telescope can be inverting or erecting; see cuts on pages 127 and 129. The objective in either case will have the same aperture. We recommend this instrument highly for all work of a high character, such as bench leveling, water-works, railroad construction, also for reconnoissance. SPECIFICATIONS : Inverting 15 inch long, aperture 1^, power 28 dia. Erecting 17 % inch long, aperture 1^, power 32 dia. Focussing slide very long and provided with a dust guard when run out for sights as near as about 12 feet. Eye-piece with large flat field of view, provided with an improved screw arrangement permitting to focus the wires by simply turning its head slightly to right or left. ' Spirit Level 7 ^ inches long between centers of suspending arms. The spirit level is very sensitive and accurately ground to a true curvature and barrel shape. <strong>Center</strong> of hard bell metal is cast in one piece with the hollow cross bar. Clamp and Tangent Screw Mahogany box provided with strap, lock, and hooks, containing sunshade, wrench, screwdriver and adjusting pins. Weight of instrument 10 Ibs. Weight of tripod about 10 Ibs. Gross weight of instrument securely packed for shipment in two boxes about 50 Ibs. Codeword: 15 inch inverting telescope Abardo " " " 17fc" erecting Aciiia Price ' each as above ' $115 (For Code Words of Extras below, see page B of complete code at back.) Extras to 5" and !7 1/" Dumpy Levels. ... $3.OO Stadia Wires fixed in ratio 1: 100 . Steel <strong>Center</strong> running in a cast iron socket to insure freest motion with perfect fit, see page 134. (Made to order only.) 1O.OO For quick leveling attachment see page 118. . . 15.OO Fine mirror mounted in case with universal joint. (This is readily attachable to either side of the instrument and facilitates the reading of the bubble on soft ground without stepping aside) . . . 1O.OO Gossamer water-proof bag, to protect the instrument in case of rain or dust l.OO Bottle of fine watch-oil to lubricate the level center .35 A detachable Vernier Compass, with variation setoff E & W and with 3'/ inch needle, can be mounted on top of these Dumpy Levels at an extra expense of $16.OO. Made to order only.
5 S- 16-inch Inverting Telescope 127 C. L. BEKGEH & SONS. Code Words for Dumpy Levels. J5-in"h Inverting Telescope with fixed stadia wires . Abardo Abella (For Extras and changes from Abardo and Abello see page B of complete code at back,)
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ENGIN. LIBRARY UC-NRLF STANDARD INS
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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
Page 82 and 83: 76 Table H. Coefficients showing th
Page 84 and 85: 78 To Find the Meridian from " Pola
Page 86 and 87: 80 REMARKS. If the instrument is no
Page 88 and 89: 82 These devices are being more and
Page 90 and 91: 84 c. Directions. For finding the S
Page 92 and 93: 6. Directions. For reducing the nor
Page 94 and 95: 88 On Stadia Measurement. Written e
Page 96 and 97: 90 included between this and the ot
Page 98 and 99: 92 Jug, R, of the rod AB is the dif
Page 100 and 101: 94 gent screw of the main telescope
Page 102 and 103: 96 zero when plates are leveled up
Page 104 and 105: i I * 2 I! all 35 e 5c u fcc - = H
Page 106 and 107: 100 Berger Short Focus Lenses. A se
Page 108 and 109: 102 NOTE. In selecting instruments
Page 110: RIBBING PARTS OF INSTRUMENTS. Patro
Page 115: The Berber Complete Engineers' and
Page 119: [Patented) The Berber Complete Mine
Page 122 and 123: 11(5 5 O o to tO u tO CM in in in o
Page 124 and 125: 118 n ai in Spirit Levels. For the
Page 126 and 127: l, 33 120
Page 128 and 129: 122
Page 130 and 131: 14 124 C. L,. BEKGEK & SONS. BOSTON
Page 134 and 135: 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.
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176 THE 5|" MOUNTAIN TRANSIT. This
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178 The 41" Mountain and Mining: Tr
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4|" 180 C. L,. BERGER & SONS. BOSTO
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182 The 4" Mountain, Mining and Rec
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184 The 4" Complete Transit- Theodo
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186 4>4 " Complete Mine Transit No.
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^ 188 t4 Mining Transits. All of th
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The 190 See M Fig. 1. Berger Patent
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03 192 Complete Mining Transit No.
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|S go Complete Wet-Mine Transit No.
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196 Different Types of Vertical Arc
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:i98 Edge G-racl nation for Vertica
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The Open-Frame Protected Vertical C
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202 C. L. BEKGKK & SONS. Flexible J
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S fa 204 Style of trivets used with
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200 Patented. The Lateral Adjuster
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Mining Transit. Interchangeable wit
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210 Tunnel Transits. Xo. 1C a Tunne
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212 Triaiigulatioii Transit- Theodo
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No. lib. 214 Complete Double Opposi
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210 No. 11 m. 7-iiich Complete Tran
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218 No. llg, 7-inch Complete Triang
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220 No. 12. 8-iiich Transit for Tri
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SPECIFICATIONS : No. 15 Alt-Azimuth
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No. 15 b. Alt.-Azimuth. 224 Alt. -A
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Portable Transit Instrument for Lat
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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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